(x+3y-2)(x-3y+2)改写为平方差公式的形式

(x+3y-2)(x-3y+2)改写为平方差公式的形式 初三下册数学二次函数将y=x^2-3+4改写为Y=a(X-H﹚^2+K的形式 x(x-y)2-(y-x)3 (x+y)(x+2y)(x+3y)(x+4y)=-40y的值为根号11 [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x [(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y) 计算：x+2y/x-y+2x/y-x-3y/x-y 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 把x=y-2分之y+1改写用x表示y的形式为_________________ .答案是x-1分之2x+1 x+2y分之x-y=3,则代数式,x+2y分之2（x-y)-3(x-y)分之x+2y的值为 若x+2y分之x-y=3,则代数式x+2y分之2（x-y)-3(x-y)分之x+2y的值为 简化|x-y+1|-2|y-x-3|+|y-x|+5其中y为负数,x为正数 x为正数,y为负数,去绝对值号,/x-y+1/-2/y-x-3/+/y-x/+5 2X(2X-3Y)-3Y(X+Y) (-2x y)^2-(3y-x)(-x-3y)