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56,78 × 7 + 56,78 × 4 - 56,78 : 0,1 + 9 × 56,78
= 56,78 × + 56,78 × 4 - 56,78 × 10 + 9 × 56,78
= 56,78 × (7 + 4 - 10 + 9)
= 56,78 × 10
= 567,8
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=72,7\times\left(54,32-44,32\right)+273\)
\(=727+273\)
\(=1000\)
![](https://rs.olm.vn/images/avt/0.png?1311)
72,7 x 54,32 - 44,32 x 72,7 + 27,3
= 72,7 x ( 54,32 - 44,32 ) + 27,3
= 72,7 x 10 + 27,3
= 727 + 27,3
= 754,3
![](https://rs.olm.vn/images/avt/0.png?1311)
= 72,7 x ( 54,32 - 44,32 )+ 2,73 x 100
= 72,7 x 10 + 2,73 x 100
= 727 + 273
= 1000
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 4,05 × 38,6 + 4,05 × 61,54
= 4,05 × ( 38,6 + 61,54 )
= 4,05 × ( 38,6 + 61,54 )
= 4,05 × 100
= 405
b, 2,15 × 23,06 + 2,15 × 76,94
= 2,15 × ( 23,06 + 76,94 )
= 2,15 × 100
= 215
c, 72,7 × 54,32 - 44,32 × 72,7
= 72,7 × ( 54,32 - 44,32 )
= 72,7 × 10
= 727
![](https://rs.olm.vn/images/avt/0.png?1311)
\(72,7\cdot54,32-44,32\cdot72,7+27,3\)
\(=72,7\left(54,32-44,32\right)+27,3\)
\(=72,7\cdot10+27,3\)
\(=727+27,3\)
\(=754,3\)
72,7 x 54,32 - 44,32 x 72,7 + 27,3
= 72,7 x ( 54,32 - 44,32 ) + 27,3
= 72,7 x 10 + 27,3
= 727 + 27,3
= 754,3
![](https://rs.olm.vn/images/avt/0.png?1311)
A = (12,45 + 7,55)+6,98
=20+6,98=26,98
B = 9,3 x (6,7 + 3,3 )
=9,3 x 10=93
a)
=(12,45+7,55)+6,89
=20+6,89
=26,89
b)
=9,3.(6,7+3,3)
=9,3.10
=93
12,34 : 10=1,234 19,34 + 35,13 =54,47 46,89 - 44,32 =2,57 56,78 x 6,98=396,3244