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a) (34,6 + 13,82 ) x 2,1 b) ( 58,34 - 21,7 ) : 5
= 48,42 x 2,1 = 36,64 : 5
= 101,682 = 7,328
Chúc bn hok tốt !
a) (34,6 + 13,82) x 2,1
= 48,42 x 2,1
= 101,682
b) (58,34 - 21,7) : 5
= 36,64 : 5
= 7,328
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 12,78 : 0,4 + 51,92
= 31,95 + 51,92
= 83,87
b) 215,34 - 38,9 : 0,5
= 215,34 - 77,8
= 137,54
c) ( 34,6 + 13,82 ) * 2,1
= 48,42 * 2,1
= 101,682
d) ( 58,34 - 21,7 ) : 5
= 36,64 : 5
= 7,328
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Với a = 3,05 thì ta có:
\(a\times2,46\) \(=3,05\times2,46=7,503\)
b) Với \(a=\dfrac{15}{8}\) thì ta có:
\(\left(\dfrac{5}{6}+\dfrac{7}{12}\right):a\) \(=\left(\dfrac{5}{6}+\dfrac{7}{12}\right):\dfrac{15}{8}\) \(=\left(\dfrac{10}{12}+\dfrac{7}{12}\right)\times\dfrac{8}{15}\) \(=\dfrac{17}{12}\times\dfrac{8}{15}\) \(=\dfrac{34}{45}\)
a) Thay a=3,05 vào 2,46a, ta được:
\(2.46\cdot3.05=7.503\)
b) Thay \(a=\dfrac{15}{8}\) vào biểu thức \(\left(\dfrac{5}{6}+\dfrac{7}{12}\right):a\), ta được:
\(\left(\dfrac{5}{6}+\dfrac{7}{12}\right):\dfrac{15}{8}\)
\(=\dfrac{17}{12}\cdot\dfrac{8}{15}=\dfrac{34}{45}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(2\dfrac{3}{5}+1\dfrac{2}{5}\cdot\dfrac{31}{2}\)
\(=\dfrac{13}{5}+\dfrac{7}{5}\cdot\dfrac{31}{2}\)
\(=\dfrac{26}{10}+\dfrac{217}{10}=\dfrac{243}{10}\)
b: \(4\dfrac{3}{4}-3\dfrac{2}{3}:1\dfrac{1}{6}\)
\(=\dfrac{19}{4}-\dfrac{11}{3}:\dfrac{7}{6}\)
\(=\dfrac{19}{4}-\dfrac{11}{3}\cdot\dfrac{6}{7}\)
\(=\dfrac{19}{4}-\dfrac{22}{7}\)
\(=\dfrac{19\cdot7-22\cdot4}{28}=\dfrac{45}{28}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\text{a. 78,9 : 2,5 : 4. }\)
\(=31,56:4=7,89.\)
\(\text{ b. 56,75 + 8,4 : 4}.\)
\(=56,75+2,1=58,85.\)
\(\text{c. 23,6 x 100 + 2,9 : 0,1. }\)
\(=2360+29=2389.\)
\(\text{ d. 58 - 4,4 : 0,1}.\)
\(=58-44=14.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: =2421,6:4,8=504,5
b: =1728:9,6=180
c: =48,19+125,12=173,31
![](https://rs.olm.vn/images/avt/0.png?1311)
a) (75,6 - 21,7) : 4 + 22,82 x 2 = 53,9 : 4 + 45,64
= 13,475 + 45,64
= 59,115
b) ???????????????????
a) ( 34,6 + 13,82 ) x 2,1
= 48,42 x 2,1
= 101,682
b ) ( 58,34 - 21,7 ) ; 5
= 36,64 : 5
= 7,328
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( ^ _ ^ )
a) 101,682
b) 7,328