990/x-990/(x+10%)=60/45 即[990(x+10%)-990x]/x(x+10%)=4/3 化简得:4/3x^2+2/15x-99=0不会.

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990/x-990/(x+10%)=60/45即[990(x+10%)-990x]/x(x+10%)=4/3化简得:4/3x^2+2/15x-99=0不会.990/x-990/(x+10%)=60/4

990/x-990/(x+10%)=60/45 即[990(x+10%)-990x]/x(x+10%)=4/3 化简得:4/3x^2+2/15x-99=0不会.
990/x-990/(x+10%)=60/45 即[990(x+10%)-990x]/x(x+10%)=4/3 化简得:4/3x^2+2/15x-99=0
不会.

990/x-990/(x+10%)=60/45 即[990(x+10%)-990x]/x(x+10%)=4/3 化简得:4/3x^2+2/15x-99=0不会.
第一步[990(x+10%)-990x] =99
第二步 x(x+10%)= x^2 +1/10X
第三步99/x^2 +0.1X =4/3
4* x^2 +0.4X =3*99
4* x^2 +0.4X -297=0
再除以个 3 结果就是那么多了