64*3.5+3.6*65用简便方法怎么计算
问题描述:
64*3.5+3.6*65用简便方法怎么计算
答
64×3.5+3.6×65
=(65-1﹚×3.5+﹙3.5+0.1﹚×65
=65×3.5-3.5+65×3.5+6.5
=65×3.5×2+3
=65×7+3
=455+3
=458