问题 解答题

用你喜欢的方法计算下列各题.

(1)7.2×0.58+0.42×7.2

(2)37+120+63

(3)155×8.3-30×8.3-25×8.3

(4)1.6×1.25.

答案

(1)7.2×0.58+0.42×7.2

=7.2×(0.58+0.42)

=7.2×1

=7.2

(2)37+120+63

=(37+63)+120

=100+120

=220

(3)155×8.3-30×8.3-25×8.3

=(155-30-25)×8.3

=100×8.3

=830

(4)1.6×1.25

=(1.25×8)×0.2

=10×0.2

=2

单项选择题
单项选择题