【題目】用簡便方法計算下面各題
4.7×10.2
0.88×4.9+5.1×0.88
2.5×8×0.4×0.125
4.85×9.9+0.485
【答案】4.7×10.2
=4.7×(10+0.2)
=4.7×10+4.7×0.2
=47+0.94
=47.94
0.88×4.9+5.1×0.88
=0.88×(4.9+5.1)
=0.88×10
=8.8
2.5×8×0.4×0.125
=(2.5×0.4)×(8×0.125)
=1×1
=1
4.85×9.9+0.485
=4.85×9.9+4.85×0.1
=4.85×(9.9+0.1)
=4.85×10
=48.5
【解析】
略
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