> 数学 >
(1)解方程:
x
x−1
=1+
2
x

(2)已知2x-y=10,求[x2+y2-(x-y)2+2y(x-y)]÷4y的值.
人气:213 ℃ 时间:2019-08-19 01:57:15
解答
(1):xx−1=1+2x方程两边同时乘以x(x-1),得x2=x(x-1)+2(x-1),解方程,得x=2,经检验,x=2是原方程的解,∴原方程的解为x=2;(2):原式=[x2+y2-(x2-2xy+y2)+2xy-2y2]÷4y,=(x2+y2-x2+2xy-y2+2xy-2y2...
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