求部骤:202²+198²
问题描述:
求部骤:202²+198²
答
202²+198²
=(202+198)² - 2*202*198
=160000 - 404*(200-2)
=160000-80800+808
=80008
答
(200+2)^2+(200-2)^2=200^2+2×200×2+2^2+200^2-2×200×2+2^2=2×200^2+2×2^2=80008