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50x+40(1100-x)=50(1+10%)x+40(1-15%)(1100-x)
人气:486 ℃ 时间:2020-05-28 17:55:33
解答
50x+40(1100-x)=50(1+10%)x+40(1-15%)(1100-x)
50x+44000-40x=55x+37400-34x
11x=6600
x=600
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