(4/20)×30=(3/25)×(30 +x)
解得X=20Kg
所以,需加20Kg水.
用含氨25分之3的氨水进行有才追肥.现有含氨20分之4的氨水30千克,配制时需加水多
用含氨25分之3的氨水进行有才追肥.现有含氨20分之4的氨水30千克,配制时需加水多
数学人气:326 ℃时间:2020-05-12 16:02:04
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