làm giùm bài tập 89,58,108;120
cảm ơn nhìu
K
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BM
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hanh 
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3.i will phone you on saturday about 11 o'clock.
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1. They are going to have a final exam at the end of May.
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3. I will phone you on Saturday, at about 11 o'clock.
4. We went to Nha Trang last summer.
5. I saw Hoa and Lan at the party yesterday.
6. We enjoyed the time very much at the party last night.
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10. My grandmother used to do all housework by herself.
AC
0
NB
giùm mình được k ? Thanks
1
D
5 tháng 10 2018
Bài 15:
Thời gian đi giai đoạn 1 là:
t1= S1/v1= 2/12= 1/6(h)
Quãng đường đi được trong giai đoạn 2:
S2= v2*t2= 20*0,5= 10(km)
Vận tốc trung bình trên cả quãng đường là:
vtb= \(\dfrac{S_1+S_2+S_3}{t_1+t_2+t_3}\)= \(\dfrac{2+10+4}{\dfrac{1}{6}+0,5+\dfrac{1}{6}}\)= 19,2(km/h)
SGK đó nha
TAO LA AI: lq j đến cái ảnh đâu bn?