Đáp án:
Giải thích các bước giải:
`a.13.64+57.34`
`= 13.64+13.4.34`
`= 13.64+13.136`
`= 13.(64+136)`
`= 13.200`
`= 2600`
`b.15.12+85.13`
`=5.3.12+5.17.13`
`= 5.36+5.221`
` = 5.(36+221)`
`= 5.257`
`= 1285`
`c. 225.92+4.450`
`=225.2.46+4.450`
`= 450.46+4.450`
`= 450.(46+4)`
`= 450.50`
`= 22500`
`d. (2+4+6+.....+10).(16.333-48.111)`
`=(2+4+6+.....+10).(16.3.111-48.111)`
`= (2+4+6+.....+10).(48.111-48.111)`
`= (2+4+6+.....+10).[48.(111-111)]`
`= (2+4+6+.....+10).(48.0)`
`= (2+4+6+.....+10).0`
`= 0`
`e.20142014.2013-20132013.2014 `
`= 10001.2014.2013-10001.2013.2014`
`= 10001(2014.2013-2013.2014)`
`= 10001.[2014.(2013-2013)]`
`= 10001.(2014.0)`
`= 10001.0`
`=0`
`g. 2990.2990-2992.2988`
`= 2990.2990-(2990+2).2988`
`= 2990.2990-2990.2988+2.2988`
`= 2990.(2990-2988)+2.2988`
`= 2990.2+2.2988`
`= 2.(2990-2988)`
`= 2.2`
`= 4`
`h. (1276.62+638.76):(24.12+76.13)`
`= (1276.62+638.2.38):(4.6.12+76.13)`
`= (1276.62+1276.38): (288+988)`
`= [1276.(62+38)]: 1276`
`= 1276.100:1276`
`= 100`
Xl vì mk đã ko lm phần i,k
