计算:(1)3x^2y^4/8z^3*10z62/-6x^2y^2(2)4x^2-y^2/3x^2y÷2x-y/xy
计算:(1)3x^2y^4/8z^3*10z62/-6x^2y^2(2)4x^2-y^2/3x^2y÷2x-y/xy
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)
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
计算:3x-2y- [-4x+(z+3y)]
计算4xy+(x-2y)的平方+(x+3y)(3y-x)
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
计算(1)x/x+y-x/x-y (2)a+2+4/a+2 (3)x^2-y^2/xy÷(x+y)
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X
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