100*20%—40*10%=+糖
100*(1-20%)—40*(1-10%)=+水
含糖10%的糖水40千克,要配制成含糖20%的糖水100千克,需要加糖和水各多少千克?
含糖10%的糖水40千克,要配制成含糖20%的糖水100千克,需要加糖和水各多少千克?
数学人气:169 ℃时间:2019-10-19 15:47:25
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