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(30-x)(解50-x)=50*30*75%怎么解
RT
人气:270 ℃ 时间:2020-02-05 21:29:33
解答
(30-x)(50-x)=50*30*75%
1500-80x+x^2=1125
x^2-80x+375=0
(x-5)(x-75)=0
x=5 or x=75
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