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3.1:
Ô tô đi hết 1h50'+40'=2h30'
3.2:
Ô tô đi hết:
17h50'-15h15'
=2h35'
Bài 1:
b: Xét ΔOAC và ΔOBD có
OA=OB
\(\widehat{AOC}=\widehat{BOD}\)
OC=OD
Do đó: ΔOAC=ΔOBD
Nếu cậu làm hết thì tớ sẽ thả đúng và một lượt theo dõi:3(không làm cũng không sao tớ cảm ơn)
\(n_{CO_2}=\dfrac{0,448}{22,4}=0,02mol\)
\(CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2\uparrow\)
0,02 0,02
\(m_{CaCO_3}=0,02\cdot100=2\left(g\right)\)
\(\%m_{CaCO_3}=\dfrac{2}{5}\cdot100\%=40\%\)
\(\%m_{CaSO_4}=100\%-40\%=60\%\)
2. won't be
3. Was he - was
4. does
5. did - go
6.will be
7. was
8. were
9. visited
10. did - went
11. washes
12. were
13. listened
14. Did he have
15. took
16. chats
17. go
18. won't eat
19. wore
20. taught
21. danced - sang
22. got - had
23. bought
24. won't go
25. had
\(#NqHahh\)
2 won't be
3 Was he - was
4 does
5 did you go
6 will be
7 was
8 were
9 visited
10 did - went
11 washes
12 were
15 took
16 chats
17 go
18 won't eat
19 wore
20 taught
21 danced - sang
22 got - had
23 bought
24 won't go
25 had