第一次剪下2/5,又接上18米
- 时间:2020-05-14 13:11:46
- 分类:数学世界
- 阅读:126 次
数学题:一根电线,第一次剪下2/5(五分之二),又接上18米,这样比原来长20%(百分之二十)。这根铁丝原来长几米?(18米就是全长的五分之二与全长的百分之二十的米数之和)
数学题解答:18÷(2/5 + 20%)=30(米)
答:这根铁丝原来长30米。
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