15,5+2,6+(1,2+0,4) .15,5
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a)
=(23.37+26.63)-(4,4+14,6)
=50 - 19
=31
b)
=(32,65+28,35)x2,6
=61 x 2,6
=158.6
c)
=(15,5 + 25,5) : 0,25 x 0,5
=41 : 0,25 x 0,5
=164 x 0.5
=82
a) 23,37 - 14,6 + 26,63 - 4,4
= ( 23,37 + 26,63 ) - ( 14,6 + 4,4 )
= 50 - 19
= 31
b ) 32,65 x 2,6 + 2,6 x 28,35
= 2,6 x ( 32,65 + 28,35 )
= 2,6 x 61
= 158,6
c) 15,5 x 0,25 x 8 + 25,5 : 0,5
= 15,5 x ( 0,25 x 8 ) + 25,5 : 0,5
= 15,5 x 2 + 25,5 x 2
= ( 15,5 + 25,5 ) x 2
= 41 x 2
= 82
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(=-15,5\left(20,8+9,2\right)+3,5\left(9,2+20,8\right)\)
\(=30\cdot\left(-12\right)=-360\)
b: \(=\dfrac{21}{20}:\dfrac{27}{10}+2+\left(\dfrac{2}{5}:\dfrac{5}{2}\right)\cdot\left(\dfrac{21}{5}-\dfrac{13}{10}\right)\)
\(=\dfrac{21}{10}\cdot\dfrac{10}{27}+2+\dfrac{4}{25}\cdot\dfrac{29}{10}\)
\(=\dfrac{7}{9}+2+\dfrac{58}{125}=\dfrac{3647}{1125}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-15,5.20,8+3,5.9,2-15,5.9,2+3,5.20,8\)
\(=-15,5\left(20,8+9,2\right)+3,5\left(9,2+20,8\right)\)
\(=\left(-15,5\right).30+3,5.30\)
\(=30.\left(-12,5\right)\)
\(=-375\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(-15,5.20,8+3,5.9,2-15,5.9,2+3,5.20,8\)
\(=20,8.\left(-15,5+3,5\right)+9,2.\left(-15,5+3,5\right)\)
\(=\left(-15,5+3,5\right).\left(20,8+9,2\right)\)
\(=\left(-12\right).30\)
\(=-360\)
Vậy : \(-15,5.20,8+3,5.9,2-15,5.9,2+3,5.20,8=-360\)
\(-15,5.20,8+3,5.9,2-15,5.9,2+3,5.20,8\)
= \(20,8.\left(-15,5+3,5\right)+9,2.\left(-15,5+3,5\right)\)
= \(20,8.\left(-12\right)+9,2.\left(-12\right)\)
= \(\left(20,8+9,2\right).\left(-12\right)\)
= \(30.\left(-12\right)\)
= \(-360.\)
Chúc bạn học tốt!
=15,5 + 2,6 + 1,6 . 15,5
= 42,9
42,9