7.29²-2.71²怎么用简便方法计算呢,
问题描述:
7.29²-2.71²怎么用简便方法计算呢,
答
7.29²-2.71²=(7.29+2.71)(7.29-2.71)=10*4.58=45.8
7.29²-2.71²怎么用简便方法计算呢,
7.29²-2.71²=(7.29+2.71)(7.29-2.71)=10*4.58=45.8