方程“(80-X)*20/X =X*7.2/(80-X)

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方程“(80-X)*20/X =X*7.2/(80-X)
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方程“(80-X)*20/X =X*7.2/(80-X)
方程“(80-X)*20/X =X*7.2/(80-X)

方程“(80-X)*20/X =X*7.2/(80-X)
(80-X)*20/X =X*7.2/(80-X)
则(80-x)²=0.36x²
则(80-x)²-0.36x²=0
则(80-x+0.6x)(80-x-0.6x)=0
则(80-0.4x)(80-1.6x)=0
则80-0.4x=0或80-1.6x=0
解得x=200或x=50
检验:将x=200,x=50分别代入原方程,左边=右边
所以x=200或x=50