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10 x 5 + 5 x 10
c1 : 10 x (5 + 5)
= 10 x 10
= 100
c2 : (10 + 10) x 5
= 20 x 5
= 100
50 + 10 + 90 + 50 + 30 + 60 + 10 + 70 + 50 + 50
c1 : (50 + 50) + (10 + 90) + (30 + 60 + 10) + (50 + 50) + 70
= 100 + 100 + 100 + 100 + 70
= 100 x 4 + 70
= 400 + 70
= 470
c2: 50 x 4 + (10 + 90) + (70 + 30) + (60 + 10)
= 200 + 100 + 100 + 70
= 200 + 100 x 2 + 70
= 200 + 200 + 70
= 200 x 2 + 70
= 400 + 70 = 470
![](https://rs.olm.vn/images/avt/0.png?1311)
1/2\(\times\)4+50%\(\times\)5+0.5
=2+2.5+0.5
=4.5+0.5
=5
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
=(M-M) .............................................................=0
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
13/50 + 74/100+ 41/100+59/100
[ 13/50 + 74/100 ] + [41/100 + 59/100]
1+1= 2
13/50 + 74% + 41/100 + 0,59
=0,26 + 0,74 + 0,41 + 0,59
=1+1
1
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
mình nhầm dấu * là dấu nhân nhá
= 50 * (0,22+0,5+0,28)
= 50 * 1
= 50