1.(-2/3x+3/2y)^2=?2.已知a+1/a=3,则a^4+1/a^4=?3.(12x^2y-8xy^2+16xy)/( )=-3x+2y-4

{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=? 结果用幂的形式表示:1.（x-y）^2(y-x)= 2.(x-y)^2(y-)^2= 3.(x-y)^2(y-x)^3= 4.(x-y)^3(y-x)= (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 1.（（y+2x)(-2x+y)+4(x+2y)^2)/3y 2.（2(x-y)^3-8(x-y）^2(x+y)+6y(x-y)^2）/2（x-y)^2 (x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) (x+y)(2x-3y)=? 1.(2x-3y)(2x+3y)=2.（5x+3y）（3y-5x）3.（x-3y）（-x+3y）=4.（x+y-z）²= 先化简再求值:(x+y)(x-y)+(x^2-2xy+y^2)-(x^2y)^3÷(x^2y)^2,其中x=1,y=2. 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 已知3x =2y 求x/x+y+y/x-y-y²/x²-y² 1.（x+2)^2-(x+y)^32.(x-y)^2-(x-y)^33.(x-y)^2-(y-x)^3 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 1.（X-Y）/13=Y/7问（x+y）/y=?.2.x/6=y/4=z/3(x.z.y不为0)则（X+3Y）/3Y-2Z=? 计算：1.（x-1)^2+2(1-x) 2.(x-y)/(x+3y)÷(x^2-y^2)/(x^2+6xy+9y^2)-2y/(x+y）1.（x-1)^2+2(1-x)2.(x-y)/(x+3y)÷(x^2-y^2)/(x^2+6xy+9y^2)-2y/(x+y） x(x-y)2-(y-x)3 {(x+2)^2-(y-3)^2=(x+y)(x-y) {x-3y=2