计算1、(x-3y)(x-6y-1)；2、(3a-b)(3a+b+5)；3、(2x-1)(x²-x-1)；4、2x(x²-2x+3)-(x+5)(2x-3)；5、3(2a+1)(2a-1)-4(3a-2)(3a+5).求解!

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) 计算：5x-2y-6+ (1/x) + (1/y) 计算x^2y^-3（x^-1y）^3 (2x+y)(x+3y-1)计算 计算3x[xy-2x(1/y-x/3]+3y(x²-y²) 计算:1/(x-y)-1/(x+y)-2y/(x^2+y^2)-4y^3/(x^4+y^4)-8x^7/(x^8+y^8) 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） 计算(x+y-1)^2 已知x=2+根号3,y=2-根号3,计算代数式(x+y/x-y-x-y/x+y)乘以(1/x^2-1/y^2) 计算:(x^-1 - y^-1)/(x^-2 - 3x^-1 y^-1 + 2y^-2) 计算:(x-y)(1/9x-y)-(1/3x-y)(1/3x+y) 计算.2x÷x/5x+3y^2-4y+4/2y-6·1/y+3÷12-6y/9-y^2 计算：(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2 计算(x-y)^7÷(y-x)^6+9-x-y)^3÷(x+y)^2 数学用乘法公式计算(x+y+1)(x+y-1)(2x-y-3)² (x+y)(x-y)-(2x+y)(x-y+1)计算要过程 计算:(x+3y)(2x-y) 计算:(2x-3y)(x+y)