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