x分之36加x减8分之4等于x减2分之40,求x
人气:208 ℃ 时间:2020-04-08 03:25:22
解答
x分之36加x减8分之4等于x减2分之40
36/x +4/(x-8)=40/(x-2)
9/x +1/(x-8)=10/(x-2)
9(x-8)(x-2) +x(x-2)=10x(x-8)
9x^2-90x+144 +x^2-2x=10x^2-80x
9x^2-90x+144 +x^2-2x=10x^2-80x
12x=144
x=12
经检验x=12是方程的根
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