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![](https://rs.olm.vn/images/avt/0.png?1311)
42*53+47*156-47*114
=47*(156-114)+42*53
=47*42+42*53
=42*(47+53)
=42*100=4200
![](https://rs.olm.vn/images/avt/0.png?1311)
12x18+14x3-255:17
=216+42-15
=258-15
=243
68+42x5-625:25
=68+210-25
=278-25
=253
13+21x5-(198/11-8)
=13+105-(18-8)
=13+105-10
=118-10
=108
272:16-5+4x(30-5-255:17)
=17-5+4x(30-5-15)
=17-5+4x(25-15)
=17-5+4x10
=17-5+40
=12+40
=52
25x8-12x5+272:17-8
=200-60+16-8
=140+16-8
=156-8
=148
![](https://rs.olm.vn/images/avt/0.png?1311)
- 225x17-225x16-225=225x[17-16-1]
=225x0
=0
- 28x76+24x28-2x48x18=28x[76+28] -2x48x18
= 28x104-1728
= 291-1728
=1184
![](https://rs.olm.vn/images/avt/0.png?1311)
a ) 341 x 67 + 341 x 16 + 659 x 83
= 341 x ( 67 + 16 ) + 659 x 83
= 341 x 83 + 659 x 83
= 83 x ( 341 + 659 )
= 83 x 1 000
= 83 000
![](https://rs.olm.vn/images/avt/0.png?1311)
3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+3+123456789+987654321=1111111152
=5344
~hok tốt~
#Trang#
42.53+47.116-47.114
= 42.125+(47.116-47.114)
= 5250+47(116-114)
= 5250+47.2
= 5250+94
= 5344