65×20+35×80怎么简算?
来源:学生作业帮助网 编辑:作业帮 时间:2024/10/07 21:57:11
65×20+35×80怎么简算?
65×20+35×80怎么简算?
65×20+35×80怎么简算?
65 × 20 + 35 × 80
= 65 × 20 + 35 × 4 × 20
= 65 × 20 + 140 × 20
= (65 + 140)× 20
= 205 × 20
= 4100
(60+5)*20+(30+5)*80
=1200+100+2400+400
=4100
(70-5)*20+(40-5)*80