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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
83,75 + 46,98 + 6,25 = (83,75 + 6,25) + 46,98 = 90 + 46,98 = 136,98
![](https://rs.olm.vn/images/avt/0.png?1311)
5,87 + 28,69 + 4,13 = (5,87 + 4,13) + 28,69 = 10 + 28,69 = 38,69.
83,75 + 46,98 + 6,25 = (83,75 + 6,25) + 46,98 = 90 + 46,98 = 136,98.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
`6,25 : 0,25 + 6,25 xx 7 - 6,25`
`= 6,25 : 1/4 + 6,25 xx7-6,25 xx1`
`=6,25 xx 4 + 6,25xx7-6,25xx1`
`=6,25 xx (4+7-1)`
`=6,25 xx10`
`=62,5`.
![](https://rs.olm.vn/images/avt/0.png?1311)
6,25 : 0,125 - 6,25 : 0,25 + 100
= ( 6,25 x 8 ) - ( 6,25 x 4 ) + 100
= 50 - 25 + 100
= 25 + 100
= 125
HT
![](https://rs.olm.vn/images/avt/0.png?1311)
a, ( 689 + 875 ) + 125
= 689 + 875 + 125
= 689 + ( 875 + 125 )
= 689 + 1000
= 1689
581 + ( 878 + 419 )
= 581 + 878 + 419
= ( 581 + 419 ) + 878
= 1000 + 878
= 1878
b, ( 2/7 + 4/9 ) + 5/7
= 2/7 + 4/9 + 5/7
= ( 2/7 + 5/7 ) + 4/9
= 1 + 4/9
= 13/9
17/11 +( 7/15 + 5/11 )
= 17/11 + 7/15 + 5/11
= ( 17/11 + 5/11 ) + 7/15
= 2 + 7/15
= 37/15
c, 5,87 + 28,69 + 4,13
= ( 5,87 + 4,13 ) + 28,69
= 10 + 28,69
= 38,69
83,75 + 46,98 + 6,25
= ( 73,75 + 6,25 ) + 46,98
= 80 + 46,98
= 126,98
![](https://rs.olm.vn/images/avt/0.png?1311)
6,25 X 8 + 6,25 : 0,5
= 6,25 x 8 + 6,25 x 2
= 6,25 x ( 8 + 2)
= 6,25 x 10
= 62,5
= 90 + 46,98
= 136,98
(83,75 + 6,25) + 46,98=90+46,98=136,98