99.9*7.8+33.3*6.6用简便方法算
问题描述:
99.9*7.8+33.3*6.6用简便方法算
答
99.9*7.8+33.3*6.6=99.9x7.8+33.3x3x2.2=99.9x(7.8+2.2)=99.9x10=999
99.9*7.8+33.3*6.6用简便方法算
99.9*7.8+33.3*6.6=99.9x7.8+33.3x3x2.2=99.9x(7.8+2.2)=99.9x10=999