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脱式计算,能简便的要简便计算.

来源:学生作业帮 编辑:神马作文网作业帮 分类:数学作业 时间:2024/11/10 13:05:23
脱式计算,能简便的要简便计算.
42÷(5.25÷0.25)

0.4+12.6÷0.28×0.2           
8.4-8.4×1.5÷1.8 0.27×99+0.27       
2.5×3.2×0.125            13.5÷2.5÷0.125÷0.4÷8.
脱式计算,能简便的要简便计算.
①42÷(5.25÷0.25)
=42÷(5.25×4)
=42÷21
=2
②0.4+12.6÷0.28×0.2 
=0.4+45×0.2
=0.4+9
=9.4
③8.4-8.4×1.5÷1.8
=8.4×(1-
5
6)
=8.4×
1
6
=1.4
④0.27×99+0.27       
=0.27×(99+1)
=0.27×100
=27
⑤2.5×3.2×0.125           
=2.5×(0.4×8)×0.125
=(2.5×0.4)×(8×0.125)
=1×1
=1
⑥13.5÷2.5÷0.125÷0.4÷8
=13.5÷(2.5×0.125×0.4×8)
=13.5÷[(2.5×0.4)×(0.125×8)]
=13.5÷[1×1]
=13.5÷1
=13.5.