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Cách 1:
85,35 : 5 + 63,05 : 5
= 17,07 + 12,61
= 29,68
Cách 2 :
85,35 : 5 + 63,05 : 5
= ( 85,35 + 63,05 ) : 5
= 148,4 : 5
= 29,68
^_^ hok tốt ^_^
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`#3107.101107`
`85,35 \div 5 + 63,05 \div 5`
`= 17,07 + 12,61`
`= 29,68`
____
`85,35 \div 5 + 63,05 \div 5`
$= 85,35 \times \dfrac{1}{5} + 63,05 \times \dfrac{1}{5}$
$= \dfrac{1}{5} \times (85,35 + 63,05)$
$= \dfrac{1}{5} \times 148,4$
$= 0,2 \times 148,4$
$= 29,68$
Cách 1:
85,35 : 5 + 63,05 : 5
=17,07 + 12,61
=29,68
Cách 2:
85,35 : 5 + 63,05 : 5
= (85,35+63,05) :5
=148,4 : 5
=29,68
![](https://rs.olm.vn/images/avt/0.png?1311)
C1 = ( 85,35 + 63,05 ) : 5
= 148,4 : 5
= 29,68
C2 : = 17,07 + 12,61
= 29,68
Hok tốt
85, 35 : 5 + 63, 05 : 5
C1: = 17, 07 + 12, 61
= 29, 68
C2 = ( 85, 35 + 63, 05 ) : 5
= 148,4 : 5
-= 29, 68
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}\)
\(=\frac{17}{15}:\left(\frac{9}{5}+\frac{8}{5}\right)\)
\(=\frac{17}{15}:3\)
\(=\frac{17}{45}\)
\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{5}=\frac{9}{5}.\frac{15}{17}+\frac{8}{5}.\frac{15}{17}=\frac{15}{17}\left(\frac{9}{5}+\frac{8}{5}\right)=\frac{15}{17}.\frac{17}{5}=3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{2}{9}+\frac{1}{5}+\frac{7}{9}+\frac{4}{5}=\left(\frac{2}{9}+\frac{7}{9}\right)+\left(\frac{1}{5}+\frac{4}{5}\right)=\frac{9}{9}+\frac{5}{5}=1+1=2\)
\(\frac{2}{9}+\frac{1}{5}+\frac{7}{9}+\frac{4}{5}=\left(\frac{2}{9}+\frac{7}{9}\right)+\left(\frac{1}{5}+\frac{4}{5}\right)=1+1=2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
cách 1 chăc ai cũng biêt mình giải cách 2 nha:ta co =(64+36):5=100:5=20
Cách 1:
64:5+36:5
=12.8+7.2
=20
Cách 2:
64:5+36:5
=(64+36):5
=100:5
=20
![](https://rs.olm.vn/images/avt/0.png?1311)
Cách 1:
\(\frac{5}{12}:\frac{2}{5}+\frac{7}{12}:\frac{2}{5}-\frac{1}{3}:\frac{2}{5}\)
\(=\frac{5}{12}\times\frac{5}{2}+\frac{7}{12}\times\frac{5}{2}-\frac{1}{3}\times\frac{5}{2}\)
\(=\frac{25}{24}+\frac{35}{24}-\frac{5}{6}\)
\(=\frac{25}{24}+\frac{35}{24}-\frac{20}{24}\)
\(=\frac{5}{3}\)
Cách 2.
\(\frac{5}{12}:\frac{2}{5}+\frac{7}{12}:\frac{2}{5}-\frac{1}{3}:\frac{2}{5}\)
\(=\frac{5}{12}\times\frac{5}{2}+\frac{7}{12}\times\frac{5}{2}-\frac{1}{3}\times\frac{5}{2}\)
\(=\left(\frac{5}{12}+\frac{7}{12}-\frac{1}{3}\right)\times\frac{5}{2}\)
\(=\left(1-\frac{1}{3}\right)\times\frac{5}{2}\)
\(=\left(\frac{3}{3}-\frac{1}{3}\right)\times\frac{5}{2}\)
\(=\frac{2}{3}\times\frac{5}{2}\)
\(=\frac{5}{3}\)
Linz
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{4}{15}+\frac{8}{13}+\frac{11}{15}+\frac{5}{13}\)
\(=\left(\frac{4}{15}+\frac{11}{15}\right)+\left(\frac{8}{13}+\frac{5}{13}\right)\)
\(=\frac{15}{15}+\frac{13}{13}\)
\(=1+1\)
\(=2\)
Chúc bạn học tốt nha !!!
\(\frac{4}{15}+\frac{8}{13}+\frac{11}{15}+\frac{5}{13}\)
\(=\left(\frac{4}{15}+\frac{11}{15}\right)+\left(\frac{8}{13}+\frac{5}{13}\right)\)
\(=1+1\)
\(=2\)
![](https://rs.olm.vn/images/avt/0.png?1311)
9/8 : 27/16 =2/3
C1: 9/5:17/15 + 8/5 : 17/15
= 27/15 + 24/15
=3
C2: 9/5 : 17/15 + 8/5 : 17/15
= ( 9/5 + 8/5 ) : 17/15
= 17/5 : 17/15
= 3
Cách 1 :
85,35 : 5 + 63,05 : 5
= 17,07 + 12,61
= 29,68
Cách 2 :
85,35 : 5 + 63,05 : 5
= ( 85,35 + 63,05 ) : 5
= 148,4 : 5
= 29,68
Cách 1 :
85,35 : 5 + 63,05 : 5 = 17,07 + 12,61 .
= 29,68 .
Cách 2 :
85,35 : 5 + 63,05 : 5 = ( 85,35 + 63,05 ) : 5 .
= 148,4 :5 .
= 29,68 .