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12 tháng 3 2023
3.1:
Ô tô đi hết 1h50'+40'=2h30'
3.2:
Ô tô đi hết:
17h50'-15h15'
=2h35'
![](https://rs.olm.vn/images/avt/0.png?1311)
11 tháng 12 2021
Bài 1:
b: Xét ΔOAC và ΔOBD có
OA=OB
\(\widehat{AOC}=\widehat{BOD}\)
OC=OD
Do đó: ΔOAC=ΔOBD
PN
11 tháng 12 2021
Nếu cậu làm hết thì tớ sẽ thả đúng và một lượt theo dõi:3(không làm cũng không sao tớ cảm ơn)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
6 tháng 11 2021
\(n_{CO_2}=\dfrac{0,448}{22,4}=0,02mol\)
\(CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2\uparrow\)
0,02 0,02
\(m_{CaCO_3}=0,02\cdot100=2\left(g\right)\)
\(\%m_{CaCO_3}=\dfrac{2}{5}\cdot100\%=40\%\)
\(\%m_{CaSO_4}=100\%-40\%=60\%\)
![](https://rs.olm.vn/images/avt/0.png?1311)
2. won't be
3. Was he - was
4. does
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\(#NqHahh\)
2 won't be
3 Was he - was
4 does
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9 visited
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