七上数学化简求值的数学题带答案
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-3a²+2a-2+a²-5a+7 4x²-5y²-5x+3y-9-4y+3+x²+5x
5a+(3x-3y-4a)其中x=2 a=3 y=4 3x-(4y-2x+1)其中x=5 y=6
(2x-3y+7)+(6x-5y-2) (a²-6a-7)-3(a²-3a+4)
(2x²-x-1)-(x²-x-1/3)+(3x²-10/3),其中x=3/2
(4x³-x²+5)+(5x²-x³-4)其中x=-2
(xy-2/3y-2/3)-(1/2x-1/2xy+1)其中x=2/3,y=3/4
-3x²y+2x²y+3xy²-2xy² 5(a+b)-4(3a-2b)+3(2a-3b)
3a²-(5a²-ab+b²)-(7ab-7b²-3a²)其中a=3 b=4
5mn+2m³n²-4mn-m³n²-5,其中m=-1,n=-2 ab³+a²b³+2-2ab+3ab³-a²b³+2ab-1,其中a=1,b=-1
1/3(-3ax²-ax+3)-(-ax²-1/2ax-1)其中,a=-2,x=3.
2(x²-xy)-3(2x²-3xy)-2【x²-(2x²-xy+y²】 x²y-z+2xy²-5x²y+4z+3xy²-3z
a³-2a²+3a-6+4a³+2a²+2a+2+7+6-9a²其中,a=8.
-2(mn-3m²)-【m²-5(mn-m²)+2mn】,其中m=1,n=-2.
-0.2a²b-6ab-1.4a²b+4.8ab+a²b 2x²y-2xy-4xy²+xy+4x²y-3xy²
12a²bc+9abc²-15a²bc²-abc²+2a²bc-a²bc²+abc²-17a²bc²+26a²bc+69abc²
3a²-5a+2-6a²+6a-3,其中a=-1/2.
-3x²y+3xy²+x³+3x²y-3xy²-y³ 其中,x=-4,y=2.
5(2a+b) ²-3(3a+2b)-3(2a+b) ²+2(3a+2b) 其中a=-3/4,b=1/2
18m-5n-【20m-(3n-6)】-2(2m+n+3) -2(x-3y)+3(2x-y)-4(2x+3y)
5x²-(3y²+5x²)-(4y²+7xy),其中x=-1,y=2.
-5/6a²b-【3/4a²c-(2/3a²c-1/6a²b)-1.5abc】-3/2abc,其中a=-2,b=9/4,c=3.
3x²yz+{xyz²-【3x²yz-(4xy²z+1/2xyz)】}-(4x²yz+xyz)
2(2a²+2ab)-(3a²+4ab-b²),其中a=2,b=-1
1/4(a+b)²-6(a-b)+3/4(a+b)²+6(a-b) -6x2-7x2+15x2-2x2 .
x3-2x2y+4xy2+y3. 2x-(x+3y)-(-x-y)-(x-y)
5(a-b)²-3(a-b)²-7(a-b)-(a-b)²+7(a-b) 2x+2y-[3x-2(x-y)]
-5yx²+4xy²-2xy+6x²y+2xy+5 5-(1-x)-1-(x-1)
16m+25-40m+34m 4a+8a-(-6a)+3a-2b
23a3bc2-15ab2c+8abc-24a3bc2-8abc 8a-5b-6c+9a+9c-8b+2b-2abc
(2x2-3xy+4y2)+(x2+2xy-3y2) 5a+6a+7a+8c+6b+56abc-96acb
4x2-[7x2-5x-3(1-2x+x2)] 4a+6ab-5bc+9abc-9b+5abc-6cb+5ab
5ab-6bc-8b+9a+6acb-6abc-95b+96c 6a+6b+6c+6ab+685a-999b+7ab-23ab
5a+6b-7c+2a-9b-5c+6abc-7acb+2bca+4bac
5a+(3x-3y-4a)其中x=2 a=3 y=4 3x-(4y-2x+1)其中x=5 y=6
(2x-3y+7)+(6x-5y-2) (a²-6a-7)-3(a²-3a+4)
(2x²-x-1)-(x²-x-1/3)+(3x²-10/3),其中x=3/2
(4x³-x²+5)+(5x²-x³-4)其中x=-2
(xy-2/3y-2/3)-(1/2x-1/2xy+1)其中x=2/3,y=3/4
-3x²y+2x²y+3xy²-2xy² 5(a+b)-4(3a-2b)+3(2a-3b)
3a²-(5a²-ab+b²)-(7ab-7b²-3a²)其中a=3 b=4
5mn+2m³n²-4mn-m³n²-5,其中m=-1,n=-2 ab³+a²b³+2-2ab+3ab³-a²b³+2ab-1,其中a=1,b=-1
1/3(-3ax²-ax+3)-(-ax²-1/2ax-1)其中,a=-2,x=3.
2(x²-xy)-3(2x²-3xy)-2【x²-(2x²-xy+y²】 x²y-z+2xy²-5x²y+4z+3xy²-3z
a³-2a²+3a-6+4a³+2a²+2a+2+7+6-9a²其中,a=8.
-2(mn-3m²)-【m²-5(mn-m²)+2mn】,其中m=1,n=-2.
-0.2a²b-6ab-1.4a²b+4.8ab+a²b 2x²y-2xy-4xy²+xy+4x²y-3xy²
12a²bc+9abc²-15a²bc²-abc²+2a²bc-a²bc²+abc²-17a²bc²+26a²bc+69abc²
3a²-5a+2-6a²+6a-3,其中a=-1/2.
-3x²y+3xy²+x³+3x²y-3xy²-y³ 其中,x=-4,y=2.
5(2a+b) ²-3(3a+2b)-3(2a+b) ²+2(3a+2b) 其中a=-3/4,b=1/2
18m-5n-【20m-(3n-6)】-2(2m+n+3) -2(x-3y)+3(2x-y)-4(2x+3y)
5x²-(3y²+5x²)-(4y²+7xy),其中x=-1,y=2.
-5/6a²b-【3/4a²c-(2/3a²c-1/6a²b)-1.5abc】-3/2abc,其中a=-2,b=9/4,c=3.
3x²yz+{xyz²-【3x²yz-(4xy²z+1/2xyz)】}-(4x²yz+xyz)
2(2a²+2ab)-(3a²+4ab-b²),其中a=2,b=-1
1/4(a+b)²-6(a-b)+3/4(a+b)²+6(a-b) -6x2-7x2+15x2-2x2 .
x3-2x2y+4xy2+y3. 2x-(x+3y)-(-x-y)-(x-y)
5(a-b)²-3(a-b)²-7(a-b)-(a-b)²+7(a-b) 2x+2y-[3x-2(x-y)]
-5yx²+4xy²-2xy+6x²y+2xy+5 5-(1-x)-1-(x-1)
16m+25-40m+34m 4a+8a-(-6a)+3a-2b
23a3bc2-15ab2c+8abc-24a3bc2-8abc 8a-5b-6c+9a+9c-8b+2b-2abc
(2x2-3xy+4y2)+(x2+2xy-3y2) 5a+6a+7a+8c+6b+56abc-96acb
4x2-[7x2-5x-3(1-2x+x2)] 4a+6ab-5bc+9abc-9b+5abc-6cb+5ab
5ab-6bc-8b+9a+6acb-6abc-95b+96c 6a+6b+6c+6ab+685a-999b+7ab-23ab
5a+6b-7c+2a-9b-5c+6abc-7acb+2bca+4bac
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