分析:加进的大米相当于原来大米的1/4+15%.
20÷(1/4+15%)
=20÷(0.25+0.15)
=20÷0.4
=50(千克)
答:这袋大米原有50千克.
一袋大米,吃去四分之一后,再加进20千克,这时袋里的米比原来的米多15%,这袋大米原有多少千克?
一袋大米,吃去四分之一后,再加进20千克,这时袋里的米比原来的米多15%,这袋大米原有多少千克?
不要解方程,
不要解方程,
数学人气:567 ℃时间:2020-04-11 20:30:06
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