Question

求50道有理数计算

最好有答案

Answer 1

3/7 × 49/9 - 4/3=1
8/9 × 15/36 + 1/27 =11/27
12× 5/6 – 2/9 ×3=28/3
8× 5/4 + 1/4 =41/4
6÷ 3/8 – 3/8 ÷6 =255/16
4/7 × 5/9 + 3/7 × 5/9 =5/9
5/2 -（ 3/2 + 4/5 ）=1/5
7/8 + （ 1/8 + 1/9 ） =10/9
9 × 5/6 + 5/6=25/3
3/4 × 8/9 - 1/3 =1/3
7 × 5/49 + 3/14 =13/14
(-7)-(+5)+(+3)-(-9) =0
-(+2 )-(-1 )-(+3 ) =-4
-14 +5+ (-3)=-12
23.33-(-76.76)= 100.09
(-6-24.3)-(-12+9.1)+(0-2.1)=-29.3
6+(7-8) =5
(-78)+25+26+27=0
(-3)+(-2)+(-1) =-6
39+28+26-125 =-32
[2/3-4-1/4+(-0.4)]+1/3+2=-1.45
22+(-4)+(-2)+4-3 =17
(-2)+7-(-16)-(-3) =24
(-5)-(+3)+(-9)-(-7) =-10
(-1/4)+(-5/6)-(-1/3)+2/3-1/6=-1/4
2/3+(-1/2)-(-1/3)+1/4 =3/4
(-5)+(-8)-(-2)-3 =-14
120-36×4÷18+35 =147
（58+37）÷（64-9×5）=5
(6.8-6.8×0.55)÷8.5 =0.36
0.12× 4.8÷0.12×4.8=23.04
（3.2×1.5+1.6）÷1.6 =4
6-1.6÷4=5.6
5.38+7.85-5.37=7.86
7.2÷0.8-1.2×5=3
6-1.19×3-0.43= -2
6.5×（4.8-1.2×4）=0
0.68×1.9+0.32×1.9 =1.9
5.8×（3.87-0.13）+4.2×3.74 =37.4
32.52-（6+9.728÷3.2）×2.5 =9.92
-5+58+13+90+78-(-56)+50=340
-7*2-57/3=-33
(-7)*2/(1/3)+90/(3+6/4）=-22
123+456+789+98/(-2)= 1319
396/33-(-54-31/15.5) =68
1.
a^3-2b^3+ab(2a-b)
=a^3+2a^2b-2b^3-ab^2
=a^2(a+2b)-b^2(2b+a)
=(a+2b)(a^2-b^2)
=(a+2b)(a+b)(a-b)

2.
(x^2+y^2)^2-4y(x^2+y^2)+4y^2
=(x^2+y^2-2y)^2

3.
(x^2+2x)^2+3(x^2+2x)+x^2+2x+3
=(x^2+2x)^2+4(x^2+2x)+3
=(x^2+2x+3)(x^2+2x+1)
=(x^2+2x+3)(x+1)^2

4.
(a+1)(a+2)+(2a+1)(a-2)-12
=a^2+3a+2+2a^2-3a-2-12
=3a^2-12
=3(a+2)(a-2)

5.
x^2(y+z)^2-2xy(x-z)(y+z)+y^2(x-z)^2
=[x(y+z)-y(x-z)]^2
=(xz+yz)^2
=z^2(x+y)^2

6.
3(a+2)^2+28(a+2)-20
=[3(a+2)-2][(a+2)+10]
=(3a+4)(a+12)

7.
(a+b)^2-(b-c)^2+a^2-c^2
=(a+b)^2-c^2+a^2-(b-c)^2
=(a+b+c)(a+b-c)+(a+b-c)(a-b+c)
=(a+b-c)(a+b+c+a-b+c)
=2(a+b-c)(a+c)

8.
x(x+1)(x^2+x-1)-2
=(x^2+x)(x^2+x-1)-2
=(x^2+x)^2-(x^2+x)-2
=(x^2+x-2)(x^2+x+1)
=(x+2)(x-1)(x^2+x+1)

Answer 2

这里有130道，可惜没有答案，希望对你有帮助

我有word文档，但不知道怎么发给你，只能给你发图片了

Answer 3

到百度文库搜索就可以。有的还有答案
http://wenku.baidu.com/search?word=%D3%D0%C0%ED%CA%FD%BC%C6%CB%E3&lm=0&od=0