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1) 125.(-24) + 24.225.
\(=24\left(-125+225\right)=24.100=2400.\)
2) 512.(2 – 128) – 128. (-512).
\(=512\left(2-128+128\right)=512.2=1024.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
-23. 63. + 23. 21- 58 .23
= 23 ( -63 + 21 - 58 )
= 23 . -100
= - 2300
hok tốt!!
![](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)
\(-23.63+23.21-58.23\)
\(=23.\left(-63+21-58\right)\)
\(=23.\left(-100\right)\)
\(=-2300\)
![](https://rs.olm.vn/images/avt/0.png?1311)
-23 . 63 + 23 . 21 - 58 . 23
= 23 . ( -63 ) + 23 . 21 - 58 . 23
= 23 . [ ( -63 ) + 21 - 58 ]
= 23 . ( -100 )
=-2300
![](https://rs.olm.vn/images/avt/0.png?1311)
-23.63+23.21-58.23
=23(-63+21-58)
=23.(-100)
=-23000
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{103}{23}-\frac{9}{14}+\frac{58}{23}-\frac{5}{4}\)
\(=\left(\frac{103}{23}+\frac{58}{23}\right)+\left(-\frac{9}{14}-\frac{5}{4}\right)\)
\(=7+\left(-\frac{18}{28}-\frac{35}{28}\right)\)
\(=7-\frac{53}{28}=\frac{196}{28}-\frac{53}{28}=\frac{143}{28}\)
23 . 158 - 23.58
= 23.(158-58)
=23.100=2300
chấm có nghĩa là j