1.-a^2(-1+a)-3a(2a^2-a-1) 2.若ab的平方=-2,则ab(ab立方+b) 3.若a^3(3a^m-2a^n-4)=3a^9-2a^6-4a^3,则m,n

问题描述:

1.-a^2(-1+a)-3a(2a^2-a-1) 2.若ab的平方=-2,则ab(ab立方+b) 3.若a^3(3a^m-2a^n-4)=3a^9-2a^6-4a^3,则m,n
1.-a^2(-1+a)-3a(2a^2-a-1)
2.若ab的平方=-2,则ab(ab立方+b)
3.若a^3(3a^m-2a^n-4)=3a^9-2a^6-4a^3,则m,n的值分别为?
4.解不等式:2x(x-1)-x(2x-5)<12
5.已知A=2a^2+3ab-b^2,B=-1/2ab,C=1/8a^3b^3-1/4a^2b^4,求2A*B^2-8C
6.计算:-2m[-2(-2m-1)+1]=
5.已知A=2a^2+3ab-b^2,B=-2分之1ab,C=8分之1a^3b^3-1/4a^2b^4,求2A*B^2-8C

1.
-a^2(-1+a)-3a(2a^2-a-1)
=-a^2(a-1)-3a(a-1)(2a+1)
=(-a)(a-1)[a+3(2a+1)]
=(1-a)(7a+3)
2.
ab^2=-2
ab(ab^3+b)
=a^2b^4+ab^2
=(ab^2)^2+ab^2
=4-2
=2
3.
a^3(3a^m-2a^n-4)=3a^9-2a^6-4a^3
3a^(m+3)-2a^(n+3)-4a^3=3a^9-2a^6-4a^3
3[a^(m+3)-a^9]-2[a^(n+3)-a^6]=0
对于任意实数a均成立,则有
m+3=9 m=6
n+3=6 n=3
4.
2x(x-1)-x(x-5)