计算x²-x/x²×x/1-x和x²-4y²/x²+2xy+y&sup
计算:(1).(-2xy²)*(3x²y)²
1-x²+2xy-y²
x²-4y²/x²+2xy+y²÷x+2y/2x²+2xy
3x²-4xy+y²
分式的约分与通分问题约分 (x²+xy)/(x+y)² x²-y²/(x&sup
证明下列极限不存在(1) Lim x+y/x-y (2)lim x²y²/ x²y&sup
分式的乘除法计算::x²-4y²/x²+2xy+y²÷x+2y/x²+
xy²/(x²y-y) × x²/(x²+x)=
xy²/(x²y) - y×x²/(x²+x)=
x³y³-x²y²-xy+1
已知x²y²+x²+y²=10xy-16 求x,y
越快越好(1)(xy²+3)(xy²+3)-2x(-x+y)(2)(x+2)(x²+4)(