![](https://rs.olm.vn/images/avt/0.png?1311)
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
94,2+y= 302.25
y=302,25-94,2
y=208,05
y=5,75 /0,29
y=19,827586
nhớ nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
23,4x 12,5 +12,5 x 75,6 + 12,5
23,4x 12,5 +12,5 x 75,6 + 12,5 x 1
12,5 x(23,4+75,6+1)
12,5 x 100
1250
23,4x12,5+12,5x75,6+12,5=12,5x(23,4+75,6+1)=12,5x100=1250
![](https://rs.olm.vn/images/avt/0.png?1311)
Theo đề, ta có:
\(\left\{{}\begin{matrix}\dfrac{a}{2}=\dfrac{b}{5}\\a-b=84\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}5a-2b=0\\5a-5b=420\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}3b=-420\\5a-2b=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}b=-140\\a=-56\end{matrix}\right.\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(R=\dfrac{5}{6}:2=\dfrac{5}{12}\left(m\right)\)
\(C=\dfrac{5}{6}\cdot3.14=\dfrac{157}{60}\left(m\right)\)
\(S=\left(\dfrac{5}{12}\right)^2\cdot3.14=\dfrac{157}{288}\left(m^2\right)\)
![](https://rs.olm.vn/images/avt/0.png?1311)
=2,34/1,25*35+21,086
=1,872*35+21,086
=65,52+21,086
=86,606
đúng đấy , k cho mình nha
![](https://rs.olm.vn/images/avt/0.png?1311)
0,0232
Chúc bn học tốt ;)