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