(1):25X²-(X²+6)²=?(2):X^3-xy²+x²y-x
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
x²/xy-x/y
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
计算:(xy-x²)×x-y/xy
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
x²+3y-xy-3x= x³-x²-x+= x²-1-2xy+y= a
已知x+y=1,xy=-二分之一,求x(x+y)(x-y)-x(x+y)²
A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x=
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若x
已知x²-10x+25+|y-3|=0,求2xy+xy分之x²+x的值
一.x-y=2,则x²-2xy+y²= 二.x-y=-1,xy=3,则x³y-2x