giúp vứi mọi ng ơi
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\(a.\dfrac{2}{3}+\dfrac{5}{4}=\dfrac{8+15}{12}=\dfrac{23}{12}.\\ b.\dfrac{3}{5}+\dfrac{9}{8}=\dfrac{24+45}{40}=\dfrac{69}{40}.\\ c.\dfrac{3}{4}-\dfrac{2}{7}=\dfrac{21-8}{28}=\dfrac{13}{28}.\\ d.\dfrac{11}{5}-\dfrac{4}{3}=\dfrac{33-20}{15}=\dfrac{13}{15}.\)
bài 2: - DT:mặt trời, bụi tre, buổi chiều, bò, sông, nước, bóng, anh, bạn
- ĐT:rúc, về, ra, uống, thấy, chào, gặp
- TT: mát
Question I
1 C
2 A
3 D
4 C
Question II
1 B
2 C
3 B
4 A
5 B
6 D
7 A
8 B
Question III
1 A
2 B
3 C
4 C
Question IV
1 plays
2 goes
3 goes
4 listens
5 watches
6 plays
7 goes
8 plays
QuestionV
1 He stayed at home because he was sick
2 It was very cold but they went swimming
3 We can go camping or we can go for a picnic
4 He didn't wash his hands so he had a stomachache
Question VI
1 They give away warm clothes to homeless people in Ha Noi.
2 We haven't had a vacation since last year
Queston VII
1 riding
2 went
3 have lived
4 take
\(a,PTHH:CaCO_3\xrightarrow{t^o}CaO+CO_2\\ b,BTKL:m_{CaCO_3}=m_{CaO}+m_{CO_2}\\ c,m_{CaO}=m_{CaCO_3}-m_{CO_2}=10-4,4=5,6(tấn)\)
\(1.Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\\ 2.N_2+3H_2-^{t^o,p,xt}\rightarrow2NH_3\\ 3.2Mg+O_2-^{t^o}\rightarrow2MgO\\ 4.4Al+3O_2-^{t^o}\rightarrow2Al_2O_3\\ 5.2H_2+O_2-^{t^o}\rightarrow2H_2O\\ 6.2Al+6HCl\rightarrow2AlCl_3+3H_2O\\7. Zn+2HCl\rightarrow ZnCl_2+H_2\\ 8.2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
bn quá đáng lắm r đó lam23q34, báo cáo bn hơi mệt
ha ha ha lam25q34 bạn lói thật là lực cười