300/x--480/2x=4 (写详细些,要写两边同乘多少?)300/x--480/2x=4 x=?300/x--480/2x=4,300/x--240/x=4,(300-240)/x=4,60/x=4,x=15

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300/x--480/2x=4 (写详细些,要写两边同乘多少?)300/x--480/2x=4 x=?300/x--480/2x=4,300/x--240/x=4,(300-240)/x=4,60/x=4,x=15
300/x--480/2x=4 (写详细些,要写两边同乘多少?)
300/x--480/2x=4
x=?
300/x--480/2x=4,300/x--240/x=4,(300-240)/x=4,60/x=4,x=15

300/x--480/2x=4 (写详细些,要写两边同乘多少?)300/x--480/2x=4 x=?300/x--480/2x=4,300/x--240/x=4,(300-240)/x=4,60/x=4,x=15
300/x--480/2x=4 x
300/x-240/x=4x
(300-240)/x=4x
60/x=4x
两边同乘x得:
60=4x^2
x^2=15
x=±√15

(300/x--480/2x)*x=4 x*x
300-240=4x*x
4*x*x=60
x*x=15
x=根号下15
娘的,不会打