>
数学
>
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
人气:276 ℃ 时间:2019-08-20 08:56:56
解答
x/2=y/3
x=2y/3
所以
x²-2xy-3y²/x²-6xy-7y²
=(x+y)(x-3y)/(x+y)(x-7y)
=(x-3y)/(x-7y)
=(2y/3-3y)/(2y/3-7y)
=(2-9)/(2-21)
=7/19
推荐
已知x/y=3,求x2+2xy−3y2x2−xy+y2.
已知x/y=-2,求(x²-2xy-3y²)/(x²-6xy-7y²)
已知关于xy的方程组2x+3y=-5 3x+7y=m,当-20<m<-10时有整数解,则x²+xy+y²=________
已知x-7y=0,且y≠0,求2x²﹢xy-3y²分之x²-3xy+y²的值
已知x/y=3,求分式x²+2xy-3y²/x²-xy+y²的值
我国古代丝绸之路开辟于哪个时期
为什么白天下雨会有太阳陪,晚上下雨月亮却不陪
___that the girl had survived the operation ,her family breathed a sigh of relief
猜你喜欢
We ( )playing basketball after school every day.
在七大洲中,面积最大的洲是_,面积最小的洲是_.
虽多忌克的多是什么意思
求导 y=3次根号下(x^2+4x+2)
学校数学小组的人数比美术小组得人数多10%,如果数学小组有30人,那么美术小组有
仿写练习题,高手们走过路过不要错过!
Have you read OliverTwist_____?Yes,I have ______read it twice.
根据汉英完成英语句字.There is a car_________ ____
© 2025 79432.Com All Rights Reserved.
电脑版
|
手机版