1.(x-y)^2-4(x-y+3)2.36a^2-25b^2-10b-13.ax^2+bx^2+bx+ax+cx^2+cx4.x^2-12xy+36y^2-6x+36y+85.4-x^2+2xy-y^2

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 1.(16y^4-9x^4)/(-3x^2-4y^2) 2.(-2x+y)(-2x-y) 因式分解：a(x-y)^2+b(y-x)^3 4(x-y)^2+8(y-x)(x+y)1.a(x-y)^2+b(y-x)^3 2.4(x-y)^2+8(y-x)(x+y) 初一计算题(请写清楚步骤）1.（x+5)(x+5)-(x-2)(x-3)2.（2x-y)(2x-y)-4(x-y)(x+2y)3.（x+y+z)(x-y+z) 1.(x^3-x^2-4x+1)/(x^2-3x+2)-(x^3-2x^2-9x+21)/（x^2-5x+6）+（x^2-3x+8）/（x^2-4x+3）2.{(x^2)/（x-y)}*{y/(x+y)}-{(x^4y)/(x^4-y^4)}÷{（x^2/x^2+y^2）^2} (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= (x+3y-4)(2x-y) 计算（2x-3y)(x+4y)-(3x+y)(x-2y)（2x-3y)(x+4y)-(3x+y)(x-2y) 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y) x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² 1.(x-2y)(x+2y)-(x平方+y)(x平方-y) 2.(2x-y)(y+2x)-(2y+x)(2y-x)3.已知：x+y=6,x平方-y平方=48,求x,y的值4.x平方-2x分之x+2 -- x平方-4x+4分之x-1 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=? 分解公因式分解 x(y-3)-(2y-6) 2.(x+y)^3-(x-y)^2(x+y) 3.x(x^2-xy)-(4x^2-4xy) (2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y) 1.(2x+y+1)(2x+y-1)2.(x-2)(x+2)-(x+1)(x-3)3.(ab+1)平方-（ab-1)平方4.（2x-y)平方-4（x-y)(x+2y) 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） 1.(x-2)(x+2)-(x+1)(x-3)2.(ab+1)^2-(ab-1)^23.(2x-y)^2-4(x-y)(x+2y) 1.(x平方+y平方/x-y)/(2xy/y-x)2.(2x+6/4-4x+x平方)/(x+3)