问题
解答题
计算 (1)a2-a4+(-a2)3 (2)(-3ab)-(-a2c)-(6ab2c) (3)(-
(4)[(a5)4÷a12]-a4. |
答案
(1)a2•a4+(-a2)3
=a6-a6
=0;
(2)(-3ab)•(-a2c)•(6ab2c)
=[-3×(-1)×6](a•a2•a)(b•b2)(c•c)
=18a4b3c2;
(3)(-
)-1+(-2)2×50-(1 4
)-21 2
=-4+4×1-4
=-4+4-4
=-4;
(4)[(a5)4÷a12]•a4
=[a20÷a12]•a4
=a8•a4.
=a12.