问题 解答题

用计算器计算:

(1)(-32.5)÷(0.25)-(-7.8)×3;

(2)(-5)2-2×(-3)2

(3)[-12×5-81÷(-9)]×(-2)4

答案

(1)(-32.5)÷(0.25)-(-7.8)×3

=-130+23.4

=-106.6;

(2)(-5)2-2×(-3)2

=25-18

=7;

(3)[-12×5-81÷(-9)]×(-2)4

=(-60+9)×16

=-816.

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