计算x+3y/x²-y²+x+2y/y²-x²+2x-3y/x²-y²看不懂的看这个图吧

来源：学生作业帮助网编辑：六六作业网时间：2024/12/26 17:29:17

计算x+3y/x²-y²+x+2y/y²-x²+2x-3y/x²-y²看不懂的看这个图吧计算x+3y/x²-y²+x+2

计算x+3y/x²-y²+x+2y/y²-x²+2x-3y/x²-y²看不懂的看这个图吧
计算x+3y/x²-y²+x+2y/y²-x²+2x-3y/x²-y²

看不懂的看这个图吧

原式=(x+3y-x-2y+2x-3y)/(x²-y²)
=(2x-2y)/(x²-y²)
=2(x-y)/[(x+y)(x-y)]
=2/(x+y)