用简便方法计算94.9²+9.98+0.1²
问题描述：
用简便方法计算94.9²+9.98+0.1²
答
49.9²+9.98+0.1²
=49.9²+2×49.9×0.1+0.1²
=(49.9+0.1)²=50²
=2500=2.5×10的3次方