金牌教练同步练习 七年级数学上册 新课标

huzhuying2022-10-04 11:39:542条回答

金牌教练同步练习 七年级数学上册 新课标
试卷9.1至9.3的倒数第三题 谢谢!

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地地就 共回答了22个问题 | 采纳率95.5%
最简单方法:令X=2a,Y=-3a,(a不等于0),然后代入计算.结果为-19/11.换元法在XY均不知,且上下幂次相同的分式中很常用.
希望能有所帮助.
1年前
lipengquit 共回答了5个问题 | 采纳率
(x -y )-(x y-3xy )-2(x y-y ) =x -y -x y+3xy -2x y+2y =x +y -3x y+3xy =(x +y )-3(x y-xy ) =-19-3(-30...
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