(m+n)²+2(m+n)+1因式分解,
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(m+n)²+2(m+n)+1因式分解,
(m+n)²+2(m+n)+1因式分解,
(m+n)²+2(m+n)+1因式分解,
(m+n)²+2(m+n)+1
=[(m+n)+1]²
=(m+n+1)²
(m+n)²+2(m+n)+1因式分解,
(m+n)²+2(m+n)+1因式分解,
(m+n)²+2(m+n)+1因式分解,
(m+n)²+2(m+n)+1
=[(m+n)+1]²
=(m+n+1)²