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a)
12,56 - ( 3,56 + 4,8 )
= 12,56 - 3,56 - 4,8
= 9 - 4,8
= 4,2
b)
15,73 - 4,21 - 7,79
= 15,73 - ( 4,21 + 7,79 )
= 15,73 - 12
= 3,73
c)
34,98 - ( 12,5 - 14,98 )
= 34,98 - 12,5 + 14,98
= 22,48 + 14,98
= 37,46
d)
87,45 - 36,9 - 34,91
= 87,45 - ( 36,9 + 34,91 )
= 87,45 - 71 ,81
= 15.64
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(y\)x\(8+y+\frac{25}{100}=36,09+\frac{1}{4}\)
<=>\(9\)x\(y=36,09+\frac{1}{4}-\frac{25}{100}\)
<=>9 x\(y=36,09\)
<=>\(y=4,01\)
vậy \(y=4,01\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 5,37 + 1,83 + 4,18 + 7,17 + 5,82 + 4,67
= (5,37 + 4,67) + (1,83 + 7,17) + ( 4,18 + 5,82)
= 10,04 + 9 + 10
= 29,04
b, 18,76 - 4,32 - 5,68 + 2,24
= (18,76 + 2,24) - (4,32 + 5,68)
= 21 - 10
= 11
c, 87,45 + 64,16 - 18,02 - 7,45 + 30,02 - 4,16
= (87,45 - 7,45 ) + (64,16 - 4,16) + (30,2 - 18,02)
= 80 + 60 + 12
= 152
d, 40 - 4,37 - 5,63 - 7,05 - 8,95 + 10
= (40 + 10) - (4,37 + 5,63) - (7,05 + 8,95)
= 50 - 10 - 16
= 40 - 16
= 24
34,98 - (12,5 + 14,98) = 34,98 - 12,5 - 14,98 = (34,98 - 14,98) - 12,5 = 20 - 12,5 = 7,5
87,45 - 36,09 - 34,91 = 87,45 - (36,09 + 34,91) = 87,45 - 71 = 16,45