作业帮计算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：作业帮 时间：2024/06/14 06:32:42
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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
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)