(x-y)²-4(x+y)²怎么化简?
(x+y)(x-2y)(x²-4y²) 其中x=8 y=-8 化简求值
[(3x+y)²-(3x-y)²]÷(4x-2y)计算 怎么做?
x²+(-2x-3y+1) (3x-2y)-2(3x-4y) 这两题怎么化简
怎么化简(x-y+4xy/x-y)(x+y-4xy/x+y)(/是分数线)
(2x-y)²-4(x-y)(x+2y)
化简:(2x-y)²-4(x-y)(x+y)
化简算式(4x-2y²)-[5x-(x-y²)]-x
(x+y)²+4(x+y)-5
化简求值 【2x²-(x+y)(x-y)][(x+y-1)(x-y+1)+1-2y],其中x=-1,y=-2
1.化简求值:(x+y)(x-y)-(x-y)²-6x²y÷2y+(2xy)²÷(-4xy
化简求值(x+y)(x-y)-(x-y)²-6x²y/2y+(2xy)²/(-4xy)其中
化简求值(x+y)(x-y)-(x-y)²-6x²y除2y+(2xy)²除(-4xy)其中