有关614x61059x61的精选大全

2018-12-22 61+4×610+59×61用简便方法计算为：61+4×610+59×61=1×61+59×61+4×610=(1+59)×61+4×610=60×61+4×610=60×61+4×10×61=60×61+40×61=(60+40)×61=100×61=6100...