简便计算(1) 5.23÷4-3.23×0.25 (2) 4.2×6.5÷1.3
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/06/17 05:50:35
简便计算(1) 5.23÷4-3.23×0.25 (2) 4.2×6.5÷1.3
(1) 5.23÷4-3.23×0.25
=5.23×0.25-3.23×0.25
=(5.23-3.23)×0.25
=2×0.25
=0.5
(2) 4.2×6.5÷1.3
=4.2×5×1.3÷1.3
=4.2×5
=21
=5.23×0.25-3.23×0.25
=(5.23-3.23)×0.25
=2×0.25
=0.5
(2) 4.2×6.5÷1.3
=4.2×5×1.3÷1.3
=4.2×5
=21
简便计算(1) 5.23÷4-3.23×0.25 (2) 4.2×6.5÷1.3
用递等式计算(能简便计算的用简便方法计算):(1)4.2÷0.25(2)1.46+(7.7+0.54)+2.3(3)(4
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