> 数学 >
x²+xy/(x-4y)(x+y),其中x=4,y=-1
人气:355 ℃ 时间:2020-04-19 10:54:06
解答
x²+xy/(x-4y)(x+y)
=x(x+y)/(x-4y)(x+y)
=x/(x-4y)
=4/(4+4)
=1/2
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版