(y²+2y)²+2(y²+2y)+1过程啊啊跪求!
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(y²+2y)²+2(y²+2y)+1过程啊啊跪求!
(y²+2y)²+2(y²+2y)+1过程啊啊跪求!
(y²+2y)²+2(y²+2y)+1过程啊啊跪求!
这是一组完全平方数
(y²+2y)²+2(y²+2y)+1
=[(y²+2y)+1]²
=(y²+2y+1)²
=[(y+1)²]²
=(y+1)^4
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(y²+2y)²+2(y²+2y)+1
=(y²+2y+1)²
=(y+1)⁴
=[y²+2y+1]²
=(y+1)⁴
利用a²+2ab+b²=(a+b)²