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\(-47.69+31.\left(-47\right)\)
\(=-47\left(69+31\right)\)
\(=-47.100\)
\(=-4700\)
\(25.11.\left(-15\right)-50.15.\left(-5\right)\)
\(=25.11.\left(-15\right)-25.15.2.\left(-5\right)\)
\(=25.\left(-15\right).11-25.\left(-15\right).10\)
\(=25.\left(-15\right).\left(11-10\right)\)
\(=25.\left(-15\right)=-375\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có :
A = 24x + 7y - 11x + 6y
=> A = ( 24x - 11x ) + ( 7y + 6y )
=> A = 13x + 13y
=> A = 13( x + y ) mà x + y = 13
=> A = 132
Ta có :
B = ( 1 + 2 + 3 + ... + 100 ) . ( 250 . 3 - 50 . 15 )
=> B = ( 1 + 2 + 3 + ... + 100 ) . ( 750 - 750 )
=> B = ( 1 + 2 + 3 + ... + 100 ) . 0
=> B = 0
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35.5 - 15.(- 5)
= (35.15).[5 - (- 5)]
= 525.10
= 5250
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\(\dfrac{5}{13}.\dfrac{8}{15}+\dfrac{5}{13}.\dfrac{26}{15}-\dfrac{5}{13}.\dfrac{8}{15}.\\ =\dfrac{5}{13}.\left(\dfrac{8}{15}+\dfrac{26}{15}-\dfrac{8}{15}\right).\\ =\dfrac{5}{13}.\dfrac{26}{15}=\dfrac{2}{3}.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có: \(B=\dfrac{5}{13}\cdot\dfrac{8}{15}+\dfrac{5}{13}\cdot\dfrac{26}{15}-\dfrac{5}{13}\cdot\dfrac{8}{15}\)
\(=\dfrac{5}{13}\cdot\dfrac{26}{15}\)
\(=\dfrac{130}{195}=\dfrac{2}{3}\)
25.11.(-15)-50.15.(-5)
=275.3.(-5)-750.(-5)
=-5(825-750)
=-5.75
-375