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.