> 数学 >
若xy=1,则1/(1+x^2)+1/(1+y^2)=?
人气:132 ℃ 时间:2020-07-04 16:45:13
解答
解 1/(1+x^2)+1/(1+y^2)
=xy/[xy+x2]+xy/[xy+y2]
=xy/x[x+y]+xy/y[x+y]
=y/[x+y]+x/[x+y]
=[x+y]/[x+y]
=1
推荐
猜你喜欢
© 2025 79432.Com All Rights Reserved.
电脑版|手机版