> 数学 >
-(2xy-y^2+1/2x^2)-2(1/3xy+1/4y^2-x^2)
人气:265 ℃ 时间:2019-10-31 02:36:28
解答
-(2xy-y^2+1/2x^2)-2(1/3xy+1/4y^2-x^2)
=-2xy+y^2-1/2x^2-2/3xy-1/2y^2+2x^2
=3x^2/2-8xy/3+y^2/2
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版