作业帮30/x - 30/(x+3) = 0.5和2x/x+1=1-x/3x+3怎么解要有过程
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30/x - 30/(x+3) = 0.5和2x/x+1=1-x/3x+3怎么解要有过程
30/x - 30/(x+3) = 0.5和2x/x+1=1-x/3x+3怎么解要有过程
30/x - 30/(x+3) = 0.5和2x/x+1=1-x/3x+3怎么解要有过程
30/x - 30/(x+3) = 0.5
两边同乘以2x(x+3),得
60(x+3)-60x=x(x+3)
x²+3x-180=0
(x-12)(x+15)=0
x=12或x=-15
经检验都是方程的根.
2x/x+1=1-x/3x+3
两边同乘以3(x+1)
6x=1-x
7x=1
x=1/7
经检验是方程的根.
30/x - 30/(x+3) = 0.5
30（x+3）-30x=0.5x(x+3)
180=x^2+3x
x=12or-15
2x/(x+1)=1-x/(3x+3)
6x=3x+3-x
x=3/4
30/x - 30/(x+3) = 0.5
30(x+3)-30x=0.5x(x+3)
30x+90-30x=0.5x^2+1.5x
0.5x^2+1.5x-90=0
x^2+3x-180=0
(x-12)(x+15)=0
x1=12,x2=-15
2x/x+1=1-x/3x+3题意不清
3X+30+X+X-15=?
x+35=(x+3x)*30%
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