18/x=(18+2)/(x+0.5)
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18/x=(18+2)/(x+0.5)18/x=(18+2)/(x+0.5)18/x=(18+2)/(x+0.5)方程两边同时乘以x(x+0.5)于是原方程变为:18(x+0.5)=20x即18x+9
18/x=(18+2)/(x+0.5)
18/x=(18+2)/(x+0.5)
18/x=(18+2)/(x+0.5)
方程两边同时乘以x(x+0.5)
于是原方程变为:
18(x+0.5)=20x
即18x+9=20x
所以2x=9
解得:x=4.5
两边乘x(x+0.5)
18x+9=20x
2x=9
x=4.5
18/x=(18+2)/(x+0.5)
x(x+0.5)·(18/x)=x(x+0.5)·(18+2)/(x+0.5)
18·(x+0.5)=20x
18x+18x0.5=20x
2x=9
x=4.5
∴x=4.5
90-x=2x(18+x)
x/(x^2+6x+18)=?
18/x=(18+2)/(x+0.5)
x+(x+3)+2x+(2x-18)=255
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