已知1/x-1/y=5,求分式2x+3xy-2y/x-2xy-y的值
人气:378 ℃ 时间:2019-10-24 09:42:20
解答
告诉你会害了你有类似的题目,自己好好想想已知1/x-1/y=3,求分式2x+3xy-2y/x-2xy-y的值根据条件可得y-x=3xy(方程1/x-1/y=3两边同乘xy) 所以分式的分子可以化简为2x+3xy-2y =2(x-y)+3xy =-6xy+3xy =-3xy 分式的分母x...
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