56^2乘2+4乘以56乘以22+44^2乘2
问题描述:
56^2乘2+4乘以56乘以22+44^2乘2
答
56²×2+4×56×22+44²×2
=2×(56²+2×56×44+44²)-2×56×44
=2×(56+44)²-56×88
=2×100²-56×88
=20000-4928
=15072