16(x-y)²-9(x+y)²
因式分解: 16(x-y)²-9(x+y)²
(x²+4y²)²-16x²y² 因式分解
已知x²y²+x²+y²=10xy-16 求x,y
已知(x²+y²)(x²+y²-6)+9=0 ,求x²+y²
分解因式:9x²-16(a+b)² 1/2x⁴y²-1/8x²y
(3x-2y)²(3x-2y)²(9x²+4y²)²
把(2z²-2x²-2y²)²-16x²y²因式分解
因式分解:16(x-y)²-9(x-y)² 用简便方法计算 202²-54²+2
1.x²-y²+6y-9
(x+y)²-2(x²-y²)+(y-x)²
化简:1.2x²-y²+(2y²-3x²)-(2y²+x²)
化简再求值[(x²+y²)²-4x²y²]÷(x²-y&su