X - 2,8 =10,6:1,5 Giúp mình vs huhu 😭😭😭😭😭
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N8
2
DT
Đỗ Thanh Hải
CTVVIP
26 tháng 11 2021
31 If we had our key, we could get into the house
32 If I hadn't been busy working, I could have seen her off at the airport
33 If the house hadn't been expensive , they wouldn't have bought it
34 If You had listened to what I told you earlier, you wouldn't be asking these questions
35 I wish you turned down the radio
35 I wish I had said goodbye to everybody before I left
37 But for his brother's ingenious plan, the stranded climber wouldn't have been rescue
38 If you hadn't written the letter, we wouldn't have known what happened
KY
8 tháng 7 2021
refer
1.T 2.F
3.T 4.F
5.F 6.F
7.T 8.T
1.He lives in Los Angeles California.
2.His sister's name Emma.
3.He wake up at about half past seven.
4.Yes,he does.
5.He leaves home at a quarter to eight.
6.He has lunch at school.
7.He returns home at a quarter past five after school.
8.He makes his homework at home.
9.Yes,he is.
26 tháng 10 2021
Câu 5:
\(\overrightarrow{AM}=\overrightarrow{AB}+\overrightarrow{BM}\)
\(=\overrightarrow{AB}+\dfrac{2}{3}\overrightarrow{BC}\)
\(=\overrightarrow{AB}-\dfrac{2}{3}\overrightarrow{AB}+\dfrac{2}{3}\overrightarrow{AC}\)
\(=\dfrac{1}{3}\overrightarrow{AB}+\dfrac{2}{3}\overrightarrow{AC}\)
26 tháng 10 2021
\(c5\) \(\overrightarrow{AM}=\overrightarrow{AB}+\overrightarrow{BM}=\overrightarrow{AB}+\dfrac{2}{3}\overrightarrow{BC}\)
\(=\overrightarrow{AB}+\dfrac{2}{3}\left(\overrightarrow{BA}+\overrightarrow{AC}\right)=\overrightarrow{AB}-\dfrac{2}{3}\overrightarrow{AB}+\dfrac{2}{3}\overrightarrow{AC}\)
\(=\dfrac{1}{3}\overrightarrow{AB}+\dfrac{2}{3}\overrightarrow{AC}\left(đpcm\right)\)
\(c4:\Rightarrow\overrightarrow{GA}+\overrightarrow{GB}+\overrightarrow{GC}=\overrightarrow{GG'}\)
\(\overrightarrow{G'A'}+\overrightarrow{G'B'}+\overrightarrow{G'C'}=\overrightarrow{GG'}\)\(\Leftrightarrow\overrightarrow{G'A}+\overrightarrow{AA'}+\overrightarrow{G'B}+\overrightarrow{B'B}+\overrightarrow{G'C}+\overrightarrow{CC'}=\overrightarrow{GG'}\)
\(\Leftrightarrow\overrightarrow{AA'}+\overrightarrow{BB'}+\overrightarrow{CC'}=3\overrightarrow{GG'}\)\(\left(dpcm\right)\)
\(c3:a,\) \(2\overrightarrow{IA}+\overrightarrow{IB}+\overrightarrow{IC}=2\overrightarrow{IA}+2\overrightarrow{IM}=2\overrightarrow{MI}+2\left(\overrightarrow{IM}+\overrightarrow{MI}\right)=2.\overrightarrow{0}=\overrightarrow{0}\left(đpcm\right)\)
\(b,2\overrightarrow{OA}+\overrightarrow{OB}+\overrightarrow{OC}\)
\(=2\left(\overrightarrow{OI}+\overrightarrow{IA}\right)+\overrightarrow{OI}+\overrightarrow{IB}+\overrightarrow{OI}+\overrightarrow{IC}\)
\(=4\overrightarrow{OI}+2\overrightarrow{IA}+\overrightarrow{IB}+\overrightarrow{IC}\)\(=4\overrightarrow{OI}+\overrightarrow{0}=4\overrightarrow{OI}\left(đpcm\right)\)
\(c2:\) \(\left\{{}\begin{matrix}3AH=2AB\\3AK=AC\\4BM=3MC\\\end{matrix}\right.\)\(\Leftrightarrow\left\{{}\begin{matrix}\overrightarrow{AB}=\dfrac{3}{2}\overrightarrow{AH}\\\overrightarrow{AC}=3\overrightarrow{AK}\\\overrightarrow{BM}=\dfrac{3}{7}\overrightarrow{BC}\Rightarrow\overrightarrow{BC}=\dfrac{7}{3}\overrightarrow{BM}\end{matrix}\right.\)
\(\Rightarrow\overrightarrow{BC}=\overrightarrow{AC}-\overrightarrow{AB}=3\overrightarrow{AK}-\dfrac{3}{2}\overrightarrow{AH}\)
\(\Rightarrow\dfrac{7}{3}\overrightarrow{BM}=3\overrightarrow{AK}-\dfrac{3}{2}\overrightarrow{AH}\Leftrightarrow\overrightarrow{BM}=\dfrac{9}{7}\overrightarrow{AK}-\dfrac{9}{14}\overrightarrow{AH}\)
9.8(6)
Bạn ghi giùm mình ra luôn được ko ??????