(3x²/4y)²×2y/3x+x²/2y²÷2y²/x

急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy) (2x-y)²-4(x-y)(x+2y) 化简：（2x-y)²-4(x-y)(x+y) (3x-y)²-2x（4x-5y）-（x+2y）² (x-y)X(2x-2y)²X(3x-3y)² [(3x+y)²-(3x-y)²]÷(4x-2y)计算 怎么做? (x+y)和(x-y)各看成一个整体,合并同类项2(x+y)-3(x-y)²+3(x+y)+4(x-y)
化简后求值 [(x-2y)²+(x-2y)(x-2y)-2x(2x-y)]÷2x 其中x=2 y=3 （x-2y）²+（2x-4y)(x+y)+(x+y)² (x-2y)²-(3x+4y)² 因式分解：X²-Y²+2X-4Y-3 因式分解 (4x+3y)²-(2x+y)²