某商场出售某种文具,每件可盈利2元,为了支援贫困山区,现在按原售价的7折出售给一山区学校,结果每件盈利0
要方程
是一元一次方程
人气:182 ℃ 时间:2019-10-23 09:28:00
解答
设文具每件的进价是x元.
70%(x+2)=x+0.2
70%x+1.4=x+0.2
30%x=1.2
x=1.2/30%
x=4
答:文具每件的进价是4元.
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