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(0.4X+56)/(0.6X-56)=5/4
人气:345 ℃ 时间:2020-04-07 06:27:25
解答
(0.4X+56)/(0.6X-56)=5/4
(0.4X+56)*4=(0.6X-56)*5
1.6X+224=3X-280
1.4X=504
X=360
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