解:
(1)原式=(x+2y)(x-2y)+x-2y
=(x-2y)(x+2y+1)
第二题狮子看不清,能在描述一遍吗
x²-4y²+x-2y
=(x-2y)(x+2y)+(x-2y)
=(x-2y)(x+2y+1)
(x²+1)²-x²+x(x-2)(x²+x+1)
=(x²+1+x)(x²+1-x)+(x²-2x)(x²+x+1)
=(x²+1+x)(x²+1-x+x²-2x)
=(x²+1+x)(2x²-3x+1)
=(x²+1+x)(2x-1)(x-1)
1. (x-2y)(x+2y+1)
2.2x4-2x-x3+1
呵呵平方不会打 请原谅