X/(x-30)=(x+40)/X解方程,
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X/(x-30)=(x+40)/X解方程,
X/(x-30)=(x+40)/X解方程,
X/(x-30)=(x+40)/X解方程,
X/(x-30)=(x+40)/X
X^2=(X-30)*(X+40)
X^2=X^2+40X-30X-1200
10X=1200
X=120
x=120
X/(x-30)=(x+40)/X
x²=x²+40x-30x-1200
10x=1200
x=120
条件X≠0 X=120
由原方程得:
X^2=(x+40)*(x-30)
x^2=x^2+10x-1200
x=120
去分母、展开化简得 10X=1200,∴X=120.
x^2=(x-30)(x+40)
x^2=x^2+10x-1200
10x=1200
x=120