X/(x-30)=(x+40)/X解方程,
人气:167 ℃ 时间:2020-06-14 23:30:33
解答
X/(x-30)=(x+40)/X
X^2=(X-30)*(X+40)
X^2=X^2+40X-30X-1200
10X=1200
X=120
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