3y/2x+2y＋2xy/x²+xy 2x/x²-64y²－1/x-8y (1/a+1/b

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3y/2x+2y＋2xy/x²+xy 2x/x²-64y²－1/x-8y (1/a+1/b)²÷(1/a²-1/b²) (3x&su
3y/2x+2y＋2xy/x²+xy 2x/x²-64y²－1/x-8y (1/a+1/b)²÷(1/a²-1/b²) (3x²/4y)²×2y/3x+x²/2y²÷2y²/x
计算

3y/2x+2y＋2xy/x²+xy=3y/2x+2y+2y/x+xy=3y/2x+2y+4y/2x+xy=7y/2x+2y+xy
2x/x²-64y²－1/x-8y =2/x-64y²－1/x-8y =1/x-64y²-8y
(1/a+1/b)²÷(1/a²-1/b²) =(1/a+1/b)²÷[(1/a+1/b)(1/a-1/b)]=(1/a+1/b)÷(1/a-1/b)=(a+b)/(b-a)
最后一题可能题目有点问题,就是+前面的可以化简,约分就可以了.

3y/2x+2y＋2xy/x²+xy 2x/x²-64y²－1/x-8y (1/a+1/b 1-x²+2xy-y² 计算:(1).(-2xy²)*(3x²y)² (x+y-2xy)(x+y-2)+(1-xy)² 已知a=2x²-3xy+y²,b=x²+2xy-3y²,化简：(1)a+b (2 设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y.若x 12x²+4x-1 x²-（a+b）xy+aby² xy-1+x-y x²-（2 设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若| 设A=2x²-3xy+y²-x+2y ,B=4x²-6xy+2y²+3x-y . 越快越好（1）(xy²+3)(xy²+3)-2x(-x+y)（2）(x+2)(x²+4)( x²-4y²/x²+2xy+y²÷x+2y/2x²+2xy 一道方程组(要过程)X²+3XY+Y²+2Y=8 2X²+2Y²+3X+3Y=1