3x-2x^2+xy-y^2+z^2-5y-4z 不改变代数式的值,把3x-2x^2+xy-y^2+z^2-5y-4z中的一次项放在前面带有“+”号的括号内,把二次项放在前面带有“-”号括号内

x²-y²+5x+3y+4（x+y-2xy)(x+y-z)+(xy-1）² 代数 x^-y^/ x^-(y-z)^ 除以 x^+2xy+y^/(x-y)^-z^ 乘 x^+xy-xz/x^-xy 24xy^2z^2(x+y+z)-32xyz(z-x-y)^2+8xyz^3(z-x-y) 24xy^2z^2(x+y+z)-32xyz(z-x-y)^2+8xyz^3(z-x-y) 化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+（z-y)(x-y)/(xy-2z)(y+z-2x)+(x-z)(y-z)/(y+z-2x)(x-2y+z)速速回答 化简x^2-yz/[x^2-(y+z)x+yz]+y^2-zx/[y^2-(z+x)y+zx]+z^2-xy/[z^2-(x+y)z+xy] (2X+Z-Y)/(X^2-XY+XZ-YZ)-(Y-Z)/(X^2-XY-XZ+YZ) 已知XY=2(X+Y),YZ=4(Y+Z),ZX=5(Z+X),求X,Y,Z已知XY=2(X+Y),YZ=4(Y+Z),ZX=5(Z+X),求X,Y,Z 求证：(x^3/x+y)+(y^3/y+z)+(z^3/z+x)大于等于（xy+yz+zx)/2 方程组xy/x+y=2 yz/y+z=4 zx/x+z=5 求x,y,z 已知1/x=5/y+z=3/z+x 求2xy/yz ÷x/Y的值 (xy-1)^2+(x+y-z)(x+y-zxy)因式分解 已知X:Y:Z等于3:4:5,求2XY-3XY+Z的平方除以X平方减2XY减Z平方 若|x-3|+|y+2|+|2z+1|=0,求(xy-yz)(y-x+z) 已知x,y,z满足x+y=5,z^2=xy+y-9 求x+2y+3z的值 已知实数x,y,z满足x+y=5,z^2=xy+y-9,那么x+2y+3z=?我很着急 已知实数x,y,z满足x-y=5,z^2=-xy-y-9,求x-2y+3z的值 已知实数x.y.z满足x+y=5及z的2次方=xy+y-9则x+2y+3z=?