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C1: \(\frac{9}{5}\div\frac{17}{15}+\frac{8}{5}\div\frac{17}{15}\)
\(=\frac{27}{17}+\frac{24}{17}\)
\(=3\)
C2: \(\frac{9}{5}\div\frac{17}{15}+\frac{8}{5}\div\frac{17}{15}\)
\(=\left(\frac{9}{5}+\frac{8}{5}\right)\div\frac{17}{15}\)
\(=\frac{17}{5}\div\frac{17}{15}\)
\(=3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
=> (9/5+8/5):17/15
=>17/5x15/17
=>17.15/17.5
=>15/5=3
ủng hộ mk nha tớ giải xong mà các bạn chưa giải cho cậu
![](https://rs.olm.vn/images/avt/0.png?1311)
C1:(9/5+8/5):17/15=17/5:17/15=3(nhớ bình chọn nha)
C2;27/17+24/17=3(nhớ bình chọn nha)
cách 1: \(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}=\frac{9}{5}.\frac{15}{17}+\frac{8}{5}.\frac{15}{17}=\frac{15}{17}.\left(\frac{9}{5}+\frac{8}{5}\right)=\frac{15}{17}.\frac{17}{5}=3\)
cách 2: \(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}=\frac{9}{5}.\frac{15}{17}+\frac{8}{5}.\frac{15}{17}=3.\frac{3}{17}+8.\frac{3}{17}=\frac{27}{17}+\frac{24}{17}=\frac{51}{17}=3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
C1: 9/5 : 17/15 + 8/5 : 17/15
= 27/17 + 14/17
= 3
C2: 9/5 : 17/15 + 8/5 : 17/15
= ( 9/5 + 8/5 ) : 17/15
= 17/5 : 17/15
= 3
b)
C1: 0,9 : 0,25 + 1.05 : 0,25
= 3,6 + 4,2
= 7,8
C2: 0,9 : 0,25 + 1,05 : 0,25
= ( 0,9 + 1,05) : 0,25
= 1,95 : 0,25
= 7,8
![](https://rs.olm.vn/images/avt/0.png?1311)
9/5 : 17/15 + 8/5 : 17/15
= 27/17 + 24/17
= 3
cách 2
( 9/5 + 8/5 ) : 17/15
=17/5 : 17/15
= 3
0,9 : 0,25 + 1,05 : 0,25
= 3,6 + 4,2
= 7,8
cách 2
0,9 : 0,25 + 1,05 : 0,25
= ( 0,9 + 1,05 ) : 0,25
= 1,95 : 0,25
= 7,8
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
A) cách 1\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}\)
\(=\frac{9}{5}\cdot\frac{15}{17}+\frac{8}{5}\cdot\frac{15}{17}\)
\(=\frac{135}{85}+\frac{120}{85}\)
\(=\frac{255}{85}\)
\(=3\)
Cách 2\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}\)
\(=\frac{9}{5}\cdot\frac{15}{17}+\frac{8}{5}\cdot\frac{15}{17}\)
\(=\frac{15}{17}\cdot\left(\frac{9}{5}+\frac{8}{5}\right)\)
=\(\frac{15}{17}\cdot\frac{17}{5}\)
\(=\frac{15\cdot17}{17\cdot5}\)
\(=\frac{5\cdot3\cdot17}{17\cdot5}\)
\(=3\)
B) Cách 1 :
0,9 : 0,25 + 1,05 : 0,25
= 3,6 + 4,2
=7,8
Cách 2:
0,9 : 0,25 + 1,05 : 0,25
\(=0,9:\frac{1}{4}+1,05:\frac{1}{4}\)
\(=0,9\cdot4+1,05\cdot4\)
\(=4\cdot\left(0,9+1,05\right)\)
\(=4\cdot1,95\)
=\(7,8\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}=\frac{9}{5}.\frac{15}{17}+\frac{8}{5}.\frac{15}{17}=\frac{15}{17}.\left(\frac{9}{5}+\frac{8}{5}\right)=\frac{15}{17}.\frac{17}{5}=\frac{15}{5}=3\)
0,9:0,25+1,05:0,25 = 0,9.4+1,05.4 = 4.(0,9+1,05)=4 . 1,95=7,8
C1: 9/5:17/15+8/5:17/15
= 27/17 + 24/17
=3
C2: 9/5:17/15+8/5:17/15
= (9/5+8/5):17/15
=17/1:17/15
=3