(x平方+4x)平方-x平方-4x-20
=(x²+4x)²-(x²+4x)-20
=(x²+4x-5)(x²+4x+4)
=(x+5)(x-1)(x+2)²
4(a)平方-4ab+b平方-6a+3b-4
=(2a-b)²-3(2a-b)-4
=(2a-b-4)(2a-b+1)
希望能帮到你O(∩_∩)O
(x平方+4x)平方-x平方-4x-20
=(x²+4x)²-(x²+4x)-20
=(x²+4x-5)(x²+4x+4)
=(x+5)(x-1)(x+2)²
4(a)平方-4ab+b平方-6a+3b-4
=(2a-b)²-3(2a-b)-4
=(2a-b-4)(2a-b+1)
希望能帮到你O(∩_∩)O