103*97用平方差公式计算
问题描述：
103*97用平方差公式计算
59.8*60.2
答
103*97
=(100+3)(100-3)
=100²-3²
=10000-9
=9991
59.8*60.2
=(60-0.2)(60+0.2)
=60²-0.2²
=3600-0.04
=3599.96