用简便方法计算(1)49.9²+9.98+0.1²(2)99²+199

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用简便方法计算(1)49.9²+9.98+0.1²(2)99²+199

用简便方法计算(1)49.9²+9.98+0.1²(2)99²+199
用简便方法计算(1)49.9²+9.98+0.1²(2)99²+199

用简便方法计算(1)49.9²+9.98+0.1²(2)99²+199
(1)49.9²+9.98+0.1²
=49.9²+2×4.99+0.1²
=(49.9+0.1)²
=50²
=2500
(2)99²+199
=99²+2×99+1
=(99+1)²
=100²
=10000