4.2(5.250.25)简便计算
答案:2 悬赏:50 手机版
解决时间 2021-02-14 18:43
- 提问者网友:最美的风景
- 2021-02-14 13:01
4.2(5.250.25)简便计算
最佳答案
- 五星知识达人网友:青尢
- 2021-02-14 13:42
4.2(5.250.25)简便计算
一、4.2(5.25×0.25)
=2.1×2×5(5.25×0.05)
=2.1×5.25×0.5
=(2×5.25+0.1×5.25)×0.5
=(10.5+0.525)×0.5
=11.025×0.5
=5.5125
二、4.2÷(5.25÷0.25)
=4.2÷21
=(4.2×10)÷21÷10
=42÷21÷10
=2÷10
=0.2=1/5
一、4.2(5.25×0.25)
=2.1×2×5(5.25×0.05)
=2.1×5.25×0.5
=(2×5.25+0.1×5.25)×0.5
=(10.5+0.525)×0.5
=11.025×0.5
=5.5125
二、4.2÷(5.25÷0.25)
=4.2÷21
=(4.2×10)÷21÷10
=42÷21÷10
=2÷10
=0.2=1/5
全部回答
- 1楼网友:神的生死簿
- 2021-02-14 14:14
4.2/(5.25/0.25)=4.2÷(525÷25)=4.2÷21=0.2
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