用简便方法计算 0.28×8.6+7.2×0.86 和999×778+333×666 怎样写?

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/22 00:04:15
用简便方法计算0.28×8.6+7.2×0.86和999×778+333×666怎样写?用简便方法计算0.28×8.6+7.2×0.86和999×778+333×666怎样写?用简便方法计算0.28×

用简便方法计算 0.28×8.6+7.2×0.86 和999×778+333×666 怎样写?
用简便方法计算 0.28×8.6+7.2×0.86 和999×778+333×666 怎样写?

用简便方法计算 0.28×8.6+7.2×0.86 和999×778+333×666 怎样写?
0.28×8.6+7.2×0.86
=2.8×0.86+7.2×0.86
=0.86×(2.8+7.2)
=0.86×10
=8.6
999×778+333×666
=999×778+999×222
=999×(778+222)
=999×1000
=999000