`@` `\text {Ans}`

`\downarrow`

`a)`

`-9/34*17/4`

`=`\(\dfrac{-9}{17\cdot2}\cdot\dfrac{17}{4}\)

`=`\(-\dfrac{9}{2}\cdot\dfrac{1}{4}\)

`=`\(-\dfrac{9}{8}\)

`b)`

\(\dfrac{17}{15}\div\dfrac{4}{3}\)

`=`\(\dfrac{17}{15}\cdot\dfrac{3}{4}\)

`=`\(\dfrac{17}{3\cdot5}\cdot\dfrac{3}{4}\)

`=`\(\dfrac{17}{5}\cdot\dfrac{1}{4}\)

`=`\(\dfrac{17}{20}\)

`c)`

\(4\dfrac{1}{5}\div\left(-2\dfrac{4}{5}\right)\)

`=`\(4\dfrac{1}{5}\cdot\left(-\dfrac{5}{14}\right)\)

`=`\(\dfrac{21}{5}\cdot\left(-\dfrac{5}{14}\right)\)

`=`\(-\dfrac{21}{14}=-\dfrac{3}{2}\)

a) \(\dfrac{-9}{34}\cdot\dfrac{17}{4}\)

\(=\dfrac{-9\cdot17}{34\cdot4}\)

\(=-\dfrac{153}{136}\)

\(=\dfrac{9}{8}\)

b) \(\dfrac{17}{15}:\dfrac{4}{3}\)

\(=\dfrac{17}{15}\cdot\dfrac{3}{4}\)

\(=\dfrac{17\cdot3}{15\cdot4}\)

\(=\dfrac{51}{60}=\dfrac{17}{20}\)

c) \(4\dfrac{1}{5}:\left(-2\dfrac{4}{5}\right)\)

\(=\dfrac{21}{5}:-\dfrac{14}{5}\)

\(=\dfrac{21}{5}\cdot-\dfrac{5}{14}\)

\(=\dfrac{21\cdot-5}{5\cdot14}\)

\(=-\dfrac{105}{70}=\dfrac{3}{2}\)

a) −934⋅17434−9​⋅417​

=−9⋅1734⋅4=34⋅4−9⋅17​

=−153136=−136153​

=98=89​

b) 1715:431517​:34​

=1715⋅34=1517​⋅43​

=17⋅315⋅4=15⋅417⋅3​

=5160=1720=6051​=2017​

c) 415:(−245)451​:(−254​)

=215:−145=521​:−514​

=215⋅−514=521​⋅−145​

=21⋅−55⋅14=5⋅1421⋅−5​

=−10570=32=−70105​=23​
 

12,34m2

9 phút 17 giây

a) 12,34  b) 9p17giây

246:x:34:x=5

=39 nha bn

cách giải bạn ơi

=00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

=00000000000000000000000000000000000000000000

\(\frac{3}{17}\times121\times\frac{34}{6}+80\times\left(0,5-5\div10\right)\)

= \(\frac{3\times121\times34}{17\times6}+80\times0\)

=\(\frac{1\times121\times2}{2}+0=121+0=121\)

\(=\dfrac{33}{17}\cdot\dfrac{34}{3}\cdot\dfrac{2}{5}=\dfrac{2\cdot11\cdot2}{5}=\dfrac{44}{5}\)

\(\dfrac{33}{17}\times\dfrac{34}{3}\times\dfrac{2}{5}=11\times2\times\dfrac{2}{5}=\dfrac{44}{5}\)

44/5

bạn có thể viết câu hỏi rõ rằng hơn được ko

ý bn là s

Hình như đề sai

Giải:

Gọi số cần tìm là a ta có:

\(\frac{34-a}{9}=\frac{1}{5}\)

\(\Rightarrow\left(34-a\right)\times5=9\)

\(\Rightarrow170-5\times a=9\)

\(\Rightarrow5\times a=161\)

\(\Rightarrow a=\frac{161}{5}\)

Vậy số cần tìm là \(\frac{161}{5}\)

Đúng ko bn