(2x+3y)²-(4x-9y)(4x+9y)+(2x-3y)²
(3x-2y)²(3x-2y)²(9x²+4y²)²
化简:1.2x²-y²+(2y²-3x²)-(2y²+x²)
再求代数式(4x²-7x+6y-1)-(-2x²+3y²+2y+2x)+(-6x²
(x+y)²-2(x²-y²)+(y-x)²
(2x+3y)²-(x+2y)² X²Y²-4XY^3 +4Y^4
求一道计算题,{(2\3x²)-(2\x²+y²)*[(x²+y²\3
化简再求值[(x²+y²)²-4x²y²]÷(x²-y&su
(1) [(-1/3)x²y][(3/4)y²-(1/2)x+(1/3)]
因式分解: 16(x-y)²-9(x+y)²
(x²+4y²)²-16x²y² 因式分解
(x+3)(x+2)怎么算啊?4x²-9y² 怎么算(过程) 3x²y×(-2xy&sup
1、x²+4y²+_______=(x-2y)²