问题 解答题
计算
(1)a2-a4+(-a23
(2)(-3ab)-(-a2c)-(6ab2c)
(3)(-
1
4
)-1+(-2)2×50-(
1
2
)-2

(4)[(a54÷a12]-a4
答案

(1)a2•a4+(-a23

=a6-a6

=0;

(2)(-3ab)•(-a2c)•(6ab2c)

=[-3×(-1)×6](a•a2•a)(b•b2)(c•c)

=18a4b3c2

(3)(-

1
4
)-1+(-2)2×50-(
1
2
)-2

=-4+4×1-4

=-4+4-4

=-4;

(4)[(a54÷a12]•a4

=[a20÷a12]•a4

=a8•a4

=a12

填空题
解答题