1.计算:(2x-5y)²(5x+2y)² 2.因式分解:(x²-2x)²-11(x²-2x)-241.计算:(2x-5y)²(5x+2y)²2.因式分解:(x²-2x)²-11(x²-2x)-24
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1.计算:(2x-5y)²(5x+2y)²2.因式分解:(x²-2x)²-11(x²-2x)-241.计算:(2x-5y)²(5x+2y)&
1.计算:(2x-5y)²(5x+2y)² 2.因式分解:(x²-2x)²-11(x²-2x)-241.计算:(2x-5y)²(5x+2y)²2.因式分解:(x²-2x)²-11(x²-2x)-24
1.计算:(2x-5y)²(5x+2y)² 2.因式分解:(x²-2x)²-11(x²-2x)-24
1.计算:(2x-5y)²(5x+2y)²
2.因式分解:(x²-2x)²-11(x²-2x)-24
1.计算:(2x-5y)²(5x+2y)² 2.因式分解:(x²-2x)²-11(x²-2x)-241.计算:(2x-5y)²(5x+2y)²2.因式分解:(x²-2x)²-11(x²-2x)-24
题目中的符号有误,应该是:
:(2x-5y)²-(5x+2y)²
=(2x-5y+5x+2y)(2x-5y-5x-2y)
=(7x-3y)(﹣3x-7y)
=﹣(7x-3y)(3x+7y)
(x²-2x)²-11(x²-2x)+24
=(x²-2x-3)(x²-2x-8)
=(x-3)(x+1)(x-4)(x+2)