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![](https://rs.olm.vn/images/avt/0.png?1311)
15 + 23 + (-25) + (-23)
= [15 + (-25)] + [23 + (-23)]
= (-10) + 0 = -10
![](https://rs.olm.vn/images/avt/0.png?1311)
15 + 23 + (-25)+(-23)
=15 + [ 23 + (-23)] + (-25)
=15+0+(-25)
= 15 + (-25)
= -10.
\(15+23+\left(-25\right)+\left(-23\right)\)
\(=15+\left(-25\right)+23+\left(-23\right)\)
\(=-10\)
![](https://rs.olm.vn/images/avt/0.png?1311)
15 + 23 + ( - 25 ) + ( - 23 )
= ( 15 - 25 ) + ( 23 - 23 )
= - 10 + 0
= - 10
![](https://rs.olm.vn/images/avt/0.png?1311)
Bạn có thể viết rõ hơn ra được không ạ . Chứ mình nhìn nó ra nhiều trường hợp lắm .
![](https://rs.olm.vn/images/avt/0.png?1311)
1,-(4+7)=(-4-7)
2,-(12-25)=(-12+25)
3,-(-8+7)=(8-7)
4,+(-15-4)=(-15-4)
5,+(23-12)=(23-12).
![](https://rs.olm.vn/images/avt/0.png?1311)
a ) \(-\frac{13}{30}+\frac{11}{20}-\frac{7}{15}\)
\(=-\frac{26}{60}+\frac{33}{60}-\frac{28}{60}\)
\(=\frac{-26+33-28}{60}=-\frac{7}{20}\)
b ) \(-\frac{5}{72}:\left(\frac{3}{8}.\frac{7}{9}\right)\)
\(=-\frac{5}{72}:\frac{3.7}{8.9}\)
\(=-\frac{5}{72}:\frac{7}{24}\)
\(=-\frac{5}{72}.\frac{24}{7}=-\frac{5}{21}\)
a) \(\frac{-13}{30}+\frac{11}{20}-\frac{7}{15}=\frac{-26}{60}+\frac{33}{60}-\frac{28}{60}=-\frac{21}{60}=-\frac{7}{20}\)
b) \(\frac{-5}{72}:\left(\frac{3}{8}.\frac{7}{9}\right)=\frac{-5}{72}:\frac{7}{24}=-\frac{5}{21}\)
c) \(\frac{-23}{25}.\frac{10}{13}+\frac{-23}{25}.\frac{3}{13}+\frac{-27}{25}\)
\(=\frac{-23}{25}.\left(\frac{10}{13}+\frac{3}{13}\right)+\frac{-27}{25}\)
\(=\frac{-23}{25}+\frac{-27}{25}\)
\(=\frac{-50}{25}=-2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a,15+23+(-25)+(-23)=[ (-23)+23] +[(-25)+15] = 0+(-10)= -10
b,-23.63+23.21-58.23=23.(-63)+23.21-58.23=23.(-63+21-58)=23.(-100)=-2300
a)
15 + 23 + ( -25 ) + ( -23 )
= [ 15 + ( -25 ) ] + [ 23 + ( -23 ) ]
= -10 + 0
= -10.
b)
-23.63 + 23.21 - 58.23
= -23 . ( 63 - 21 + 58 )
= -23 . 100
= -2300.
15 + 23 + (-25) + (-23)
= [23 + (-23)] + [15 + (-25)]
= 0 + (-10)
= -10
15 + 23 + ( -25 ) + ( -23 )
= [ 15 + ( -15 ) ] + [ ( -23 ) + 23 ]
= 0 + 0
= 0
k cho mk nha !