选择合适的方法计算下面各题: 19
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选择合适的方法计算下面各题:
(1)
1 9×0.25+ 8 9÷4- 1 4, = 1 9× 1 4+ 8 9× 1 4- 1 4, =( 1 9+ 8 9-1)× 1 4, =0× 1 4, =0; (2) 11 7×0.375- 4 7÷ 8 3, = 11 7×0.375- 4 7×0.375, =( 11 7- 4 7)×0.375, =1×0.375, =0.375; (3) 7 4- 5 6÷ 5 4- 1 3, = 7 4- 2 3- 1 3, = 7 4-( 2 3+ 1 3), = 7 4-1, = 3 4; (4)302×15-6950÷50, =4530-139, =4391. |