(2010•龙海市)选择合适的方法,计算下面各题. 18.7-4.375-6.625 920÷40﹢23×50 12×(
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(2010•龙海市)选择合适的方法,计算下面各题.
18.7-4.375-6.625 | 920÷40﹢23×50 | |
12×(
(1)18.7-4.375-6.625,
=18.7-(4.375+6.625), =18.7-11, =7.7; (2)920÷40﹢23×50, =23+23×50, =23+1150, =1173; (3)12×( 1 4+ 1 6- 1 3), =12× 1 4+12× 1 6-12× 1 3, =3+2-4, =1; (4)4.4× 3 4+3.6÷1 1 3+0.75×2, =4.4× 3 4+3.6× 3 4+ 3 4×2, = 3 4×(4.4+3.6+2), = 3 4×10, = 15 2. |