2x/x²-64y²-1/x-8y
2x/x²-64y²-1/x-8y
3y/2x+2y+2xy/x²+xy 2x/x²-64y²-1/x-8y (1/a+1/b
1-x²+2xy-y²
计算(2x/x²-64y²) - (1/x-8y)
计算2x/x²-64y² - 1/x-8y
分解因式:9x²-16(a+b)² 1/2x⁴y²-1/8x²y
计算:(1).(-2xy²)*(3x²y)²
(x+y)²-2(x²-y²)+(y-x)²
化简:1.2x²-y²+(2y²-3x²)-(2y²+x²)
因式分解:4x²-y²-2y-1
证明下列极限不存在(1) Lim x+y/x-y (2)lim x²y²/ x²y&sup
一道方程组(要过程)X²+3XY+Y²+2Y=8 2X²+2Y²+3X+3Y=1