设买了练习本X本,可得方程
1.2x+2(20-x)=36
1.2x+40-2x=36
-0.8x =-4
x =5
答:练习本买了5本
给最佳.
练习本每本1.2元,软面抄每本2元,共买了20本,花了36元,练习本卖了多少本?
练习本每本1.2元,软面抄每本2元,共买了20本,花了36元,练习本卖了多少本?
数学人气:230 ℃时间:2020-01-31 04:39:03
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