1.x+(-y+3)2.x-(-3-y)3.-(x-y)+34.3-(x+y)2.判断..哪里错误 并改正x的平方减括号3X减2括号 等于 X的平方减3X减27A加括号5B减1等于7A+5B=12M的平方减括号3M加5括号等于2M的平方减3M减5负号括号A减B括号加括号A

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 (3x-y)(3y+x)-(x-y)(x+y) 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)^2-(x+y)^32.(x-y)^2-(x-y)^33.(x-y)^2-(y-x)^3 1.(x-y)(x^2+xy+y^2) 2.(3x+2y)(2x+3y) 1.(16y^4-9x^4)/(-3x^2-4y^2) 2.(-2x+y)(-2x-y) 1.计算(a^2+a+1)(a^2-a+1) 2.计算(x-y)(x+y)+(3x-2y)(2x+y)-x(6x-y) x(x-y)2-(y-x)3 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) 计算：1.(-x+2y+3z)(x-2y-3z) 2.[(x/2+3y)^2-(y/2+x)^2+(3x-2/y)^2-(x/2+3y)(3y-y/2)]÷x/2 （y-x)+x(x-y)^3-(y-x)^4 因式分解 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)= 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+y-z)+(x-y+z)-(x-y-z) 2.2x-(3x-2y+3)-(5y-2) {(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=? 因式分解1.(x^2-y+1)(x^2+1)+x^2y+y-x^2 2.(x+5y)^2+(2x+10y)(3x-y)+(y-3x)^2 1.(x+y)²-4（x+y-1)2.(x-y)²+4xy3.(x-1)(x+3)+1 [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x