简便计算19.08平方-19.08*39.16+20.08平方

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简便计算19.08平方-19.08*39.16+20.08平方

简便计算19.08平方-19.08*39.16+20.08平方
简便计算19.08平方-19.08*39.16+20.08平方

简便计算19.08平方-19.08*39.16+20.08平方
19.08²-19.08×39.16+20.08²
=19.08²-2×19.08×19.58+(19.58+0.5)²
=19.08²-2×19.08×19.58+19.58²+2×0.5×19.58+0.5²
=(19.08-19.58)²+19.58+0.5²
=(-0.5)²+19.58+0.5²
=0.25+19.58+0.25
=19.58+0.5
=20.08