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a = 2,45 x ( 46 + 54 ) + 8 x (0,5 + 0,75 )
= 2,45 x 100 + 8 x 1,25
= 245 + 10
= 255
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a, 48,22 : 2,45 - 23,72 : 2,45
= ( 48,22 - 23,72): 2,45
= 24,5 : 2,45
= 10
b, 3,45 cm3 + 3,45 cm3 \(\times\) 9
= 3,45 cm3 \(\times\) 1 + 3,45 cm3 \(\times\) 9
= 3,45 cm3 \(\times\) ( 1 + 9)
= 3,45 cm3 \(\times\) 10
= 34,5 cm3
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
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`2,45xx46+8xx0,75xx54xx2,45xx0,5xx8`
`=2,45xx46+54xx2,45+8xx0,75+0,5xx8`
`=2,45xx(46+54)+8xx(0,75+0,5)`
`=2,45xx100+8xx1,25`
`=245+10`
`=255`
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
2,45 x 46 + 0,75 x 54 x 2,45 + 0,5 x 8
= 2,45 x 46 + 40,5 x 2,45 + 4
= 2,45 x ( 46 + 40,5 ) + 4
= 2,45 x 86,5 + 4
= 211,925 +4
= 215,925
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a) \(2\dfrac{4}{9}+6\dfrac{7}{11}+7\dfrac{5}{9}+13\dfrac{4}{11}\)
\(=2+\dfrac{4}{9}+6+\dfrac{7}{11}+7+\dfrac{5}{9}+13+\dfrac{4}{11}\)
\(=\left(2+6+7+13\right)+\left(\dfrac{4}{9}+\dfrac{5}{9}\right)+\left(\dfrac{7}{11}+\dfrac{4}{11}\right)\)
\(=28+1+1\)
\(=30\)
b) \(\dfrac{3}{4}+\dfrac{1}{2}\times\dfrac{12}{5}-1\dfrac{1}{2}\)
\(=\dfrac{3}{4}+\dfrac{1}{2}-1-\dfrac{1}{2}\)
\(=\dfrac{3}{4}-1\)
\(=\dfrac{3}{4}-\dfrac{4}{4}\)
\(=-\dfrac{1}{4}\)
=13,4-2,45:10
=13,4-0,245
=13,155
=13,4-0,49*2
=13,4-0,98
=12,42