3个回答
展开全部
1. 3/7 × 49/9 - 4/3
2. 8/9 × 15/36 + 1/27
3. 12× 5/6 – 2/9 ×3
4. 8× 5/4 + 1/4
5. 6÷ 3/8 – 3/8 ÷6
6. 4/7 × 5/9 + 3/7 × 5/9
7. 5/2 -( 3/2 + 4/5 )
8. 7/8 + ( 1/8 + 1/9 )
9. 9 × 5/6 + 5/6
10. 3/4 × 8/9 - 1/3
11. 7 × 5/49 + 3/14
12. 6 ×( 1/2 + 2/3 )
13. 8 × 4/5 + 8 × 11/5
14. 31 × 5/6 – 5/6
15. 9/7 - ( 2/7 – 10/21 )
16. 5/9 × 18 – 14 × 2/7
17. 4/5 × 25/16 + 2/3 × 3/4
18. 14 × 8/7 – 5/6 × 12/15
19. 17/32 – 3/4 × 9/24
20. 3 × 2/9 + 1/3
21. 5/7 × 3/25 + 3/7
22. 3/14 ×× 2/3 + 1/6
23. 1/5 × 2/3 + 5/6
24. 9/22 + 1/11 ÷ 1/2
25. 5/3 × 11/5 + 4/3
26. 45 × 2/3 + 1/3 × 15
27. 7/19 + 12/19 × 5/6
28. 1/4 + 3/4 ÷ 2/3
29. 8/7 × 21/16 + 1/2
30. 101 × 1/5 – 1/5 × 21
31.50+160÷40 (58+370)÷(64-45)
32.120-144÷18+35
33.347+45×2-4160÷52
34(58+37)÷(64-9×5)
35.95÷(64-45)
36.178-145÷5×6+42 420+580-64×21÷28
37.812-700÷(9+31×11) (136+64)×(65-345÷23)
38.85+14×(14+208÷26)
39.(284+16)×(512-8208÷18)
40.120-36×4÷18+35
41.(58+37)÷(64-9×5)
42.(6.8-6.8×0.55)÷8.5
43.0.12× 4.8÷0.12×4.8
44.(3.2×1.5+2.5)÷1.6 (2)3.2×(1.5+2.5)÷1.6
45.6-1.6÷4= 5.38+7.85-5.37=
46.7.2÷0.8-1.2×5= 6-1.19×3-0.43=
47.6.5×(4.8-1.2×4)= 0.68×1.9+0.32×1.9
48.10.15-10.75×0.4-5.7
49.5.8×(3.87-0.13)+4.2×3.74
50.32.52-(6+9.728÷3.2)×2.5
51.已知x+y=5,2x-y=1,化简xy(x+y的平方)-y的平方(xy-x)+2x(x-y的平方),并求它们的值。
52.3ab-4ab+8ab-7ab+ab=______.
53.7x-(5x-5y)-y=______.
54.23a3bc2-15ab2c+8abc-24a3bc2-8abc=______.
55.-7x2+6x+13x2-4x-5x2=______.
56.2y+(-2y+5)-(3y+2)=______.
57.(2x2-3xy+4y2)+(x2+2xy-3y2)=______.
58.2a-(3a-2b+2)+(3a-4b-1)=______.
59.-6x2-7x2+15x2-2x2=______.
60.2x-(x+3y)-(-x-y)-(x-y)=______.
61.2x+2y-[3x-2(x-y)]=______.
62.5-(1-x)-1-(x-1)=______.
63.( )+(4xy+7x2-y2)=10x2-xy.
64.(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3.
65.已知A=x3-2x2+x-4,B=2x3-5x+3,计算A+B=______.
66.已知A=x3-2x2+x-4,B=2x3-5x+3,计算A-B=______.
67.若a=-0.2,b=0.5,代数式-(|a2b|-|ab2|)的值为______.
68.一个多项式减去3m4-m3-2m+5得-2m4-3m3-2m2-1,那么这个多项式等于______.
69.-(2x2-y2)-[2y2-(x2+2xy)]=______.
70.若-3a3b2与5ax-1by+2是同类项,则x=______,y=______.
71.(-y+6+3y4-y3)-(2y2-3y3+y4-7)=______.
72.化简代数式4x2-[7x2-5x-3(1-2x+x2)]的结果是______.
73.2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( ).
74.3a-(2a-3b)+3(a-2b)-b=______.
75.化简代数式x-[y-2x-(x+y)]等于______.
76.[5a2+( )a-7]+[( )a2-4a+( )]=a2+2a+1.
77.3x-[y-(2x+y)]=______.
78.化简|1-x+y|-|x-y|(其中x<0,y>0)等于______.
79.已知x≤y,x+y-|x-y|=______.
80.已知x<0,y<0,化简|x+y|-|5-x-y|=______.
81.4a2n-an-(3an-2a2n)=______.
82.若一个多项式加上-3x2y+2x2-3xy-4=2x2y+3xy2-x2+2xy, 则这个多项式为______.
83.-5xm-xm-(-7xm)+(-3xm)=______.
84.当a=-1,b=-2时, [a-(b-c)]-[-b-(-c-a)]=______.
85.当a=-1,b=1,c=-1时,-[b-2(-5a)]-(-3b+5c)=______.
86.-2(3x+z)-(-6x)+(-5y+3z)=______.
87.-5an-an+1-(-7an+1)+(-3an)=______.
88.3a-(2a-4b-6c)+3(-2c+2b)=______.
89.9a2+[7a2-2a-(-a2+3a)]=______.
90.当2y-x=5时,5(x-2y)2-3(-x+2y)-100=______.
91.下列各式中计算结果为-7x-5x2+6x3的是 [ ]
A.3x-(5x2+6x3-10x);
B.3x-(5x2+6x3+10x);
C.3x-(5x2-6x3+10x);
D.3x-(5x2-6x3-10x).
92.把(-x-y)+3(x+y)-5(x+y)合并同类项得 [ ]
A.(x-y)-2(x+y);
B.-3(x+y);
C.(-x-y)-2(x+y);
D.3(x+y).
93.2a-[3b-5a-(2a-7b)]等于 [ ]
A.-7a+10b;
B.5a+4b;
C.-a-4b;
D.9a-10b.
94.减去-3m等于5m2-3m-5的代数式是 [ ]
A.5(m2-1);
B.5m2-6m-5;
C.5(m2+1);
D.-(5m2+6m-5).
95.将多项式2ab-9a2-5ab-4a2中的同类项分别结合在一起,应为 [ ]
A.(9a2-4a2)+(-2ab-5ab);
B.(9a2+4a2)-(2ab-5ab);
C.(9a2-4a2)-(2ab+5ab);
D.(9a2-4a2)+(2ab-5ab).
96.当a=2,b=1时,-a2b+3ba2-(-2a2b)等于 [ ]
A.20;
B.24;
C.0;
D.16.
97.若A和B均为五次多项式,则A-B一定是 [ ]
A.十次多项式;
B.零次多项式;
C.次数不高于五次的多项式;
D.次数低于五次的多项式.
98.-{[-(x+y)]}+{-[(x+y)]}等于 [ ]
A.0;
B.-2y;
C.x+y;
D.-2x-2y.
99.若A=3x2-5x+2,B=3x2-5x+6,则A与B的大小是 [ ]
A.A>B;
B.A=B;
C.A<B;
D.无法确定.
100.当m=-1时,-2m2-[-4m2+(-m2)]等于 [ ]
A.-7;
B.3;
C.1;
D.2.
101.当m=2,n=1时,多项式-m-[-(2m-3n)]+[-(-3m)-4n]等于 [ ]
A.1;
B.9;
C.3;
D.5.
102.-5an-an-(-7an)+(-3an)等于 [ ]
A.-16an;
B.-16;
C.-2an;
D.-2.
103.(5a-3b)-3(a2-2b)等于 [ ]
A.3a2+5a+3b;
B.2a2+3b;
C.2a3-b2;
D.-3a2+5a-5b.
104.x3-5x2-4x+9等于 [ ]
A.(x3-5x2)-(-4x+9);
B.x3-5x2-(4x+9);
C.-(-x3+5x2)-(4x-9);
D.x3+9-(5x2-4x).
105.4x2y-5xy2的结果应为 [ ]
A.-x2y;
B.-1;
C.-x2y2;
D.以上答案都不对.
106.(4x2-8x+5)-(x3+3x2-6x+2).
107.(0.3x3-x2y+xy2-y3)-(-0.5x3-x2y+0.3xy2).
108.-{2a2b-[3abc-(4ab2-a2b)]}.
109.(5a2b+3a2b2-ab2)-(-2ab2+3a2b2+a2b).
110.(x2-2y2-z2)-(-y2+3x2-z2)+(5x2-y2+2z2).
111.(3a6-a4+2a5-4a3-1)-(2-a+a3-a5-a4).
112.(4a-2b-c)-5a-[8b-2c-(a+b)].
113.(2m-3n)-(3m-2n)+(5n+m).
114.(3a2-4ab-5b2)-(2b2-5a2+2ab)-(-6ab).
115.xy-(2xy-3z)+(3xy-4z).
116.(-3x3+2x2-5x+1)-(5-6x-x2+x3).
117.3x-(2x-4y-6x)+3(-2z+2y).
118.(-x2+4+3x4-x3)-(x2+2x-x4-5).
119.若A=5a2-2ab+3b2,B=-2b2+3ab-a2,计算A+B.
120.已知A=3a2-5a-12,B=2a2+3a-4,求2(A-B).
121.2m-{-3n+[-4m-(3m-n)]}.
122.5m2n+(-2m2n)+2mn2-(+m2n).
123.4(x-y+z)-2(x+y-z)-3(-x-y-z).
124.2(x2-2xy+y2-3)+(-x2+y2)-(x2+2xy+y2).
125.2(a2-ab-b2)-3(4a-2b)+2(7a2-4ab+b2).
126.4x-2(x-3)-3[x-3(4-2x)+8].
将下列各式先化简,再求值
127.已知a+b=2,a-b=-1,求3(a+b)2(a-b)2-5(a+b)2×(a-b)2的值.
128.已知A=a2+2b2-3c2,B=-b2-2c2+3a2,C=c2+2a2-3b2,求(A-B)+C.
129.求(3x2y-2xy2)-(xy2-2x2y),其中x=-1,y=2.
130.已知|x+1|+(y-2)2=0,求代数式5(2x-y)-3(x-4y)的值.
131.当P=a2+2ab+b2,Q=a2-2ab-b2时,求P-[Q-2P-(P-Q)].
132.求2x2-{-3x+5+[4x2-(3x2-x-1)]}的值,其中x=-3.
133.当x=-2,y=-1,z=3时,求5xyz-{2x2y-[3xyz-(4xy2-x2y)]}的值.
134.已知A=x3-5x2,B=x2-6x+3,求A-3(-2B).
135.去括号:{-[-(a+b)]}-{-[-(a-b)]}.
136.去括号:-[-(-x)-y]-[+(-y)-(+x)].
137.已知A=x3+6x-9,B=-x3-2x2+4x-6,计算2A-3B,并把结果放在前面带“-”号的括号内.
138.计算下式,并把结果放在前面带“-”号的括号内:
(-7y2)+(-4y)-(-y2)-(+5y)+(-8y2)+(+3y).
139.去括号、合并同类项,将结果按x的升幂排列,并把后三项放在带有“-”号的括号内:
140.不改变下式的值,将其中各括号前的符号都变成相反的符号:(x3+3x2)-(3x2y-7xy)+(2y3-3y2).
141.把多项式4x2y-2xy2+4xy+6-x2y2+x3-y2的三次项放在前面带有“-”号的括号内,二次项放在前面带有“+”号的括号内,四次项和常数项放在前面带有“-”号的括号内.
142.把下列多项式的括号去掉,合并同类项,并将其各项放在前面带有“-”号的括号内,再求2x-2[3x-(5x2-2x+1)]-4x2的值,其中x=-1.
143.合并同类项:
7x-1.3z-4.7-3.2x-y+2.1z+5-0.1y.
144.合并同类项:5m2n+5mn2-mn+3m2n-6mn2-8mn.
145.去括号,合并同类项:
(1)(m+1)-(-n+m);
(2)4m-[5m-(2m-1)].
146.化简:2x2-{-3x-[4x2-(3x2-x)+(x-x2)]}.
147.化简:-(7x-y-2z)-{[4x-(x-y-z)-3x+z]-x}.
148.计算:(+3a)+(-5a)+(-7a)+(-31a)-(+4a)-(-8a).
149.化简:a3-(a2-a)+(a2-a+1)-(1-a4+a3).
150.将x2-8x+2x3-13x2-2x-2x3+3先合并同类项,再求值,其中x=-4.
2. 8/9 × 15/36 + 1/27
3. 12× 5/6 – 2/9 ×3
4. 8× 5/4 + 1/4
5. 6÷ 3/8 – 3/8 ÷6
6. 4/7 × 5/9 + 3/7 × 5/9
7. 5/2 -( 3/2 + 4/5 )
8. 7/8 + ( 1/8 + 1/9 )
9. 9 × 5/6 + 5/6
10. 3/4 × 8/9 - 1/3
11. 7 × 5/49 + 3/14
12. 6 ×( 1/2 + 2/3 )
13. 8 × 4/5 + 8 × 11/5
14. 31 × 5/6 – 5/6
15. 9/7 - ( 2/7 – 10/21 )
16. 5/9 × 18 – 14 × 2/7
17. 4/5 × 25/16 + 2/3 × 3/4
18. 14 × 8/7 – 5/6 × 12/15
19. 17/32 – 3/4 × 9/24
20. 3 × 2/9 + 1/3
21. 5/7 × 3/25 + 3/7
22. 3/14 ×× 2/3 + 1/6
23. 1/5 × 2/3 + 5/6
24. 9/22 + 1/11 ÷ 1/2
25. 5/3 × 11/5 + 4/3
26. 45 × 2/3 + 1/3 × 15
27. 7/19 + 12/19 × 5/6
28. 1/4 + 3/4 ÷ 2/3
29. 8/7 × 21/16 + 1/2
30. 101 × 1/5 – 1/5 × 21
31.50+160÷40 (58+370)÷(64-45)
32.120-144÷18+35
33.347+45×2-4160÷52
34(58+37)÷(64-9×5)
35.95÷(64-45)
36.178-145÷5×6+42 420+580-64×21÷28
37.812-700÷(9+31×11) (136+64)×(65-345÷23)
38.85+14×(14+208÷26)
39.(284+16)×(512-8208÷18)
40.120-36×4÷18+35
41.(58+37)÷(64-9×5)
42.(6.8-6.8×0.55)÷8.5
43.0.12× 4.8÷0.12×4.8
44.(3.2×1.5+2.5)÷1.6 (2)3.2×(1.5+2.5)÷1.6
45.6-1.6÷4= 5.38+7.85-5.37=
46.7.2÷0.8-1.2×5= 6-1.19×3-0.43=
47.6.5×(4.8-1.2×4)= 0.68×1.9+0.32×1.9
48.10.15-10.75×0.4-5.7
49.5.8×(3.87-0.13)+4.2×3.74
50.32.52-(6+9.728÷3.2)×2.5
51.已知x+y=5,2x-y=1,化简xy(x+y的平方)-y的平方(xy-x)+2x(x-y的平方),并求它们的值。
52.3ab-4ab+8ab-7ab+ab=______.
53.7x-(5x-5y)-y=______.
54.23a3bc2-15ab2c+8abc-24a3bc2-8abc=______.
55.-7x2+6x+13x2-4x-5x2=______.
56.2y+(-2y+5)-(3y+2)=______.
57.(2x2-3xy+4y2)+(x2+2xy-3y2)=______.
58.2a-(3a-2b+2)+(3a-4b-1)=______.
59.-6x2-7x2+15x2-2x2=______.
60.2x-(x+3y)-(-x-y)-(x-y)=______.
61.2x+2y-[3x-2(x-y)]=______.
62.5-(1-x)-1-(x-1)=______.
63.( )+(4xy+7x2-y2)=10x2-xy.
64.(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3.
65.已知A=x3-2x2+x-4,B=2x3-5x+3,计算A+B=______.
66.已知A=x3-2x2+x-4,B=2x3-5x+3,计算A-B=______.
67.若a=-0.2,b=0.5,代数式-(|a2b|-|ab2|)的值为______.
68.一个多项式减去3m4-m3-2m+5得-2m4-3m3-2m2-1,那么这个多项式等于______.
69.-(2x2-y2)-[2y2-(x2+2xy)]=______.
70.若-3a3b2与5ax-1by+2是同类项,则x=______,y=______.
71.(-y+6+3y4-y3)-(2y2-3y3+y4-7)=______.
72.化简代数式4x2-[7x2-5x-3(1-2x+x2)]的结果是______.
73.2a-b2+c-d3=2a+( )-d3=2a-d3-( )=c-( ).
74.3a-(2a-3b)+3(a-2b)-b=______.
75.化简代数式x-[y-2x-(x+y)]等于______.
76.[5a2+( )a-7]+[( )a2-4a+( )]=a2+2a+1.
77.3x-[y-(2x+y)]=______.
78.化简|1-x+y|-|x-y|(其中x<0,y>0)等于______.
79.已知x≤y,x+y-|x-y|=______.
80.已知x<0,y<0,化简|x+y|-|5-x-y|=______.
81.4a2n-an-(3an-2a2n)=______.
82.若一个多项式加上-3x2y+2x2-3xy-4=2x2y+3xy2-x2+2xy, 则这个多项式为______.
83.-5xm-xm-(-7xm)+(-3xm)=______.
84.当a=-1,b=-2时, [a-(b-c)]-[-b-(-c-a)]=______.
85.当a=-1,b=1,c=-1时,-[b-2(-5a)]-(-3b+5c)=______.
86.-2(3x+z)-(-6x)+(-5y+3z)=______.
87.-5an-an+1-(-7an+1)+(-3an)=______.
88.3a-(2a-4b-6c)+3(-2c+2b)=______.
89.9a2+[7a2-2a-(-a2+3a)]=______.
90.当2y-x=5时,5(x-2y)2-3(-x+2y)-100=______.
91.下列各式中计算结果为-7x-5x2+6x3的是 [ ]
A.3x-(5x2+6x3-10x);
B.3x-(5x2+6x3+10x);
C.3x-(5x2-6x3+10x);
D.3x-(5x2-6x3-10x).
92.把(-x-y)+3(x+y)-5(x+y)合并同类项得 [ ]
A.(x-y)-2(x+y);
B.-3(x+y);
C.(-x-y)-2(x+y);
D.3(x+y).
93.2a-[3b-5a-(2a-7b)]等于 [ ]
A.-7a+10b;
B.5a+4b;
C.-a-4b;
D.9a-10b.
94.减去-3m等于5m2-3m-5的代数式是 [ ]
A.5(m2-1);
B.5m2-6m-5;
C.5(m2+1);
D.-(5m2+6m-5).
95.将多项式2ab-9a2-5ab-4a2中的同类项分别结合在一起,应为 [ ]
A.(9a2-4a2)+(-2ab-5ab);
B.(9a2+4a2)-(2ab-5ab);
C.(9a2-4a2)-(2ab+5ab);
D.(9a2-4a2)+(2ab-5ab).
96.当a=2,b=1时,-a2b+3ba2-(-2a2b)等于 [ ]
A.20;
B.24;
C.0;
D.16.
97.若A和B均为五次多项式,则A-B一定是 [ ]
A.十次多项式;
B.零次多项式;
C.次数不高于五次的多项式;
D.次数低于五次的多项式.
98.-{[-(x+y)]}+{-[(x+y)]}等于 [ ]
A.0;
B.-2y;
C.x+y;
D.-2x-2y.
99.若A=3x2-5x+2,B=3x2-5x+6,则A与B的大小是 [ ]
A.A>B;
B.A=B;
C.A<B;
D.无法确定.
100.当m=-1时,-2m2-[-4m2+(-m2)]等于 [ ]
A.-7;
B.3;
C.1;
D.2.
101.当m=2,n=1时,多项式-m-[-(2m-3n)]+[-(-3m)-4n]等于 [ ]
A.1;
B.9;
C.3;
D.5.
102.-5an-an-(-7an)+(-3an)等于 [ ]
A.-16an;
B.-16;
C.-2an;
D.-2.
103.(5a-3b)-3(a2-2b)等于 [ ]
A.3a2+5a+3b;
B.2a2+3b;
C.2a3-b2;
D.-3a2+5a-5b.
104.x3-5x2-4x+9等于 [ ]
A.(x3-5x2)-(-4x+9);
B.x3-5x2-(4x+9);
C.-(-x3+5x2)-(4x-9);
D.x3+9-(5x2-4x).
105.4x2y-5xy2的结果应为 [ ]
A.-x2y;
B.-1;
C.-x2y2;
D.以上答案都不对.
106.(4x2-8x+5)-(x3+3x2-6x+2).
107.(0.3x3-x2y+xy2-y3)-(-0.5x3-x2y+0.3xy2).
108.-{2a2b-[3abc-(4ab2-a2b)]}.
109.(5a2b+3a2b2-ab2)-(-2ab2+3a2b2+a2b).
110.(x2-2y2-z2)-(-y2+3x2-z2)+(5x2-y2+2z2).
111.(3a6-a4+2a5-4a3-1)-(2-a+a3-a5-a4).
112.(4a-2b-c)-5a-[8b-2c-(a+b)].
113.(2m-3n)-(3m-2n)+(5n+m).
114.(3a2-4ab-5b2)-(2b2-5a2+2ab)-(-6ab).
115.xy-(2xy-3z)+(3xy-4z).
116.(-3x3+2x2-5x+1)-(5-6x-x2+x3).
117.3x-(2x-4y-6x)+3(-2z+2y).
118.(-x2+4+3x4-x3)-(x2+2x-x4-5).
119.若A=5a2-2ab+3b2,B=-2b2+3ab-a2,计算A+B.
120.已知A=3a2-5a-12,B=2a2+3a-4,求2(A-B).
121.2m-{-3n+[-4m-(3m-n)]}.
122.5m2n+(-2m2n)+2mn2-(+m2n).
123.4(x-y+z)-2(x+y-z)-3(-x-y-z).
124.2(x2-2xy+y2-3)+(-x2+y2)-(x2+2xy+y2).
125.2(a2-ab-b2)-3(4a-2b)+2(7a2-4ab+b2).
126.4x-2(x-3)-3[x-3(4-2x)+8].
将下列各式先化简,再求值
127.已知a+b=2,a-b=-1,求3(a+b)2(a-b)2-5(a+b)2×(a-b)2的值.
128.已知A=a2+2b2-3c2,B=-b2-2c2+3a2,C=c2+2a2-3b2,求(A-B)+C.
129.求(3x2y-2xy2)-(xy2-2x2y),其中x=-1,y=2.
130.已知|x+1|+(y-2)2=0,求代数式5(2x-y)-3(x-4y)的值.
131.当P=a2+2ab+b2,Q=a2-2ab-b2时,求P-[Q-2P-(P-Q)].
132.求2x2-{-3x+5+[4x2-(3x2-x-1)]}的值,其中x=-3.
133.当x=-2,y=-1,z=3时,求5xyz-{2x2y-[3xyz-(4xy2-x2y)]}的值.
134.已知A=x3-5x2,B=x2-6x+3,求A-3(-2B).
135.去括号:{-[-(a+b)]}-{-[-(a-b)]}.
136.去括号:-[-(-x)-y]-[+(-y)-(+x)].
137.已知A=x3+6x-9,B=-x3-2x2+4x-6,计算2A-3B,并把结果放在前面带“-”号的括号内.
138.计算下式,并把结果放在前面带“-”号的括号内:
(-7y2)+(-4y)-(-y2)-(+5y)+(-8y2)+(+3y).
139.去括号、合并同类项,将结果按x的升幂排列,并把后三项放在带有“-”号的括号内:
140.不改变下式的值,将其中各括号前的符号都变成相反的符号:(x3+3x2)-(3x2y-7xy)+(2y3-3y2).
141.把多项式4x2y-2xy2+4xy+6-x2y2+x3-y2的三次项放在前面带有“-”号的括号内,二次项放在前面带有“+”号的括号内,四次项和常数项放在前面带有“-”号的括号内.
142.把下列多项式的括号去掉,合并同类项,并将其各项放在前面带有“-”号的括号内,再求2x-2[3x-(5x2-2x+1)]-4x2的值,其中x=-1.
143.合并同类项:
7x-1.3z-4.7-3.2x-y+2.1z+5-0.1y.
144.合并同类项:5m2n+5mn2-mn+3m2n-6mn2-8mn.
145.去括号,合并同类项:
(1)(m+1)-(-n+m);
(2)4m-[5m-(2m-1)].
146.化简:2x2-{-3x-[4x2-(3x2-x)+(x-x2)]}.
147.化简:-(7x-y-2z)-{[4x-(x-y-z)-3x+z]-x}.
148.计算:(+3a)+(-5a)+(-7a)+(-31a)-(+4a)-(-8a).
149.化简:a3-(a2-a)+(a2-a+1)-(1-a4+a3).
150.将x2-8x+2x3-13x2-2x-2x3+3先合并同类项,再求值,其中x=-4.
追问
答案
追答
1.1 2.11/27 3.28/3 4.41/4 5.255/16 6.5/9 7.1/5 8.10/9 9.25/3
10.1/3 11.13/14 12.7 13.24 14.25 15.31/21 16.6 17.7/4 18.46/3
19.1/4 20.1 21.18/35 22.13/42 23.87/90 24.13/22 25.5 26.35
27.17/19 28.11/8 29.2 30.16 31.90,428/19 32.147 33.517
34.5 35.5 36.185,952 37.810,10000 38.393 39.16800 40.147
41.5 42.0.36 43.23.04 44.4.5625,8 45.-0.4,7.86 46.3,2 47.0,1.9
48.0.15 49.37.4 50.9.92 51.2 52.ab 53.2x+4y 54.-36abc 55.30+2x
78.1 79.2x 80.-5 81.2(3a2n-2an) 82.5x^2y+5xy-3x^2-3xy^2+4
83.-2xm 84.0 85.17 86.z-5y 87.-2an+1 88.a+10b 89. 17a^2-5a
90.10
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