题目内容
【题目】简便计算。
53.8-13.65-16.35 25×38.6×4
24×10.2 0.73×9.9+0.1×0.73
【答案】23.8;3860
244.8;7.3
【解析】
根据加法的结合律,乘法的结合律及分配律进行简算。
53.8-13.65-16.35
=53.8-(13.65+16.35)
=53.8-30
=23.8
25×38.6×4
=25×4×38.6
=100×38.6
=3860
24×10.2
=24×(10+0.2)
=24×10+24×0.2
=240+4.8
=244.8
0.73×9.9+0.1×0.73
=0.73×(9.9+0.1)
=0.73×10
=7.3
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