Question

1.计算- [(-x)^3]^4的正确结果是( ) A.-X^12 B.X^12 C.-X^7 D.X^7 2.计算(a

Answer 1

1.B 2.B 3.1,1 4.-10b-a 5.4n,m-4n 6.m+n-1 7.-162 (3分之一x^3n)^2-3(x^2)^2n =1/9·x^6n－3·x^4n =1/9·﹙x^2n﹚－3·﹙x^2n) =1/9×9－3×9 =81－3×81=﹣2×81=-162