用简便方法计算99999+99999
问题描述:
用简便方法计算99999+99999
答
99999^2+99999=99999^2+2*99999+1-99999-1 =(99999+1)^2-100000 =10000000000-100000 =9999900000
用简便方法计算99999+99999
99999^2+99999=99999^2+2*99999+1-99999-1 =(99999+1)^2-100000 =10000000000-100000 =9999900000