计算(2x-3y-1)(2x+3y-1)

(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:(-x-2y) * (3x-y) 计算(x+y)(x+y)^2(-x-y)^3 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) 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:(2/3x√9x+6x√y/x)+(y√x/y-√1/x) 数学用乘法公式计算(x+y+1)(x+y-1)(2x-y-3)² (1)计算：a-(a^2)/(a+1)-1 (2)计算：3x/(x-4y)+(x+y)/(4y-x)-7y/(x-4y) 计算(4x^2-2x^3+6x)/(-2x)-(x-1)^2y^2-4/y^2-y-6)+(y+2/y-3)/(y+1/ 有这样一道题:"计算(2*x*x*x-3*x*x*y-2*x*y*y)-(x*x*x-2*x*y*y+y*y*y)+【-