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-48+48.(-78)+48.(-21)
=48.(-1)+48.(-78)+48.(-21)
=48.(-1+(-78)+(-21))
=48.(-100)
=-4800
![](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)
\(-48+48\cdot\left(-78\right)+48\cdot\left(-21\right)=\left(-48\right)\cdot\left(1+78+21\right)\)
\(=\left(-48\right)\cdot100\)
\(=-4800\)
![](https://rs.olm.vn/images/avt/0.png?1311)
(42x43+43x57+43)-360:4=(43x(42+57+1))-90
=(43x100)-90
=4300-90
=4210
![](https://rs.olm.vn/images/avt/0.png?1311)
Tính hợp lí
-48+48.(-78)+48.(-21) = 48.(-1) + 48.(-78) + 48.(-21) = 48. ( -1+ -78 + -21 ) = 48 .(-100) = -4800
![](https://rs.olm.vn/images/avt/0.png?1311)
-48+48.(-78)+48.(-21)
=48.(-1-78-21)
=48.-100
=-4800
happy new year
![](https://rs.olm.vn/images/avt/0.png?1311)
-48+48*(-78)+48*(-21)
= 48*(-1)+48*(-78)+48*(-21)
= 48*(-1-78-21)
= 48*(-100)=-4800
![](https://rs.olm.vn/images/avt/0.png?1311)
-48+[48x(-78+-21)]
=-48+48x-99
=48x(-99+-1)
=48x-100
=-4800
- 48 + 48 . ( - 78 ) + 48 . ( - 21 )
= 48. [ -1 + ( - 78 ) + ( - 21 ) ]
= 48. ( - 100 )
= - 4800