请给位大师帮忙做下这几道题:1.(x+y)(x+y)-2 2.(x²-x)²-14x²+1
请给位大师帮忙做下这几道题:1.(x+y)(x+y)-2 2.(x²-x)²-14x²+1
1-x²+2xy-y²
计算:(1).(-2xy²)*(3x²y)²
(x+y)²-2(x²-y²)+(y-x)²
化简:1.2x²-y²+(2y²-3x²)-(2y²+x²)
x²-4y²/x²+2xy+y²÷x+2y/2x²+2xy
因式分解:4x²-y²-2y-1
x³y³-x²y²-xy+1
x²-4y² x+2y
(3x-2y)²(3x-2y)²(9x²+4y²)²
证明下列极限不存在(1) Lim x+y/x-y (2)lim x²y²/ x²y&sup
分解因式:9x²-16(a+b)² 1/2x⁴y²-1/8x²y