计算y-3/4y-8÷(y+2-5/y-2)

计算y-3/4y-8÷(y+2-5/y-2) y-3/4y-8÷(5/y-2-y-2) 计算` 计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2) 计算：[(y+1)/(y^2-4y+3)减去(y-2)/(y^2-6y+9)]除以(y-5)/(y-1) 计算2（y-2)*（y+3)- 5（y-3)*（y+8) 计算（y-2)(y^3+8)(y^2+2y+4) 计算：(-3y)^2(2y+1)-(3y-5)(3y+4) 计算（3y-1)(2y+3)-(6y-5)(y-4) 计算.2x÷x/5x+3y^2-4y+4/2y-6·1/y+3÷12-6y/9-y^2 计算：（1）8x^2y^2*(-3x/4y^5) (2)(x+y)^2/xy-y^2*(y-x)^2/xy+y^2 计算：(x-y)^8÷(y-x)^4×(x-y) 计算:y×(y/x)^3÷[-(x^2)/y]^-2 计算6x³y^6÷(1/2)y³÷(-3x²y)-(12x^4y^6-8x²y^4-16x³y^5)÷4x²y³ 6y-(y+2分之y+2-y分之y)÷(y^3-4y-2y^2+8分之y) 怎么算 （y-3）/（4y-8）÷（y+2-5/（y-2）） y-3/4y-8÷（5/y-2 -y-2) 一道数学题, 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) [2(x-y)^5-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2[2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2