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I)1.B
2.B
3.C
4.D
5.C
II)
1.B
2.D
3.B
4.B
5.A
6.B
7.tell....way.
8.C
III)
1.isn't teaching
2.drive
3.has
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1 Jill reminded John to do the washing up
2 The police ordered his men to search all the shops on that street
3 She blamed me for ignoring the notice about life-saving equipment
4 My aunt advised me not to argut with my father
5 Stella congratulated Jeff on having got an promotion at last
6 Kevin apoligized to Sarah for making her angry
7 The man warn his son to put down the gun
8 Ron denied being in the town on the night of the robbery
9 Ted promise to pay back the money at the end of that month
10 George encouraged Susan to send her story to the magazine
11 Natalie accused Tom of lying to her
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\(\left(x:2,2\right)\times\dfrac{1}{6}=\dfrac{-3}{8}\times\left(0,5-1\dfrac{3}{5}\right)\)
\(\Rightarrow\left(x:2,2\right)\times\dfrac{1}{6}=\dfrac{-3}{8}\times\left(\dfrac{1}{2}-\dfrac{8}{5}\right)\)
\(\Rightarrow\left(x:2,2\right)\times\dfrac{1}{6}=\dfrac{-3}{8}\times\dfrac{11}{10}\)
\(\Rightarrow\left(x:2,2\right)\times\dfrac{1}{6}=\dfrac{33}{80}\)
\(\Rightarrow x:2,2=\dfrac{33}{80}:\dfrac{1}{6}\)
\(\Rightarrow x:2,2=\dfrac{99}{40}\)
\(\Rightarrow x=\dfrac{99}{40}\times2,2\)
\(\Rightarrow x=\dfrac{1089}{200}\)
=>(x:2,2)*1/6=-3/8(1/2-8/5)=33/80
=>x:2,2=99/40
=>x=1089/200
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Bài 1:
a: Xét (O) có
ΔACB nội tiếp đường tròn
AB là đường kính
Do đó: ΔACB vuông tại C
Xét ΔABC có
O là trung điểm của AB
H là trung điểm của BC
Do đó: OH là đường trung bình của ΔABC
Suy ra: OH//AC
hay OH\(\perp\)CB
Suy ra: ΔOHB vuông tại H
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a) Cl2 + 2NaOH --> NaClO + NaCl + H2O
Chất oxh: Cl2, chất khử: Cl2
Sự oxh | Cl0 -1e--> Cl+1 | x1 |
Sự khử | Cl0 +1e--> Cl-1 | x1 |
b) \(n_{Cl_2}=\dfrac{17,92}{22,4}=0,8\left(mol\right);n_{NaOH}=0,5.4=2\left(mol\right)\)
PTHH: Cl2 + 2NaOH --> NaClO + NaCl + H2O
_____0,8---->1,6--------->0,8---->0,8
=> \(\left\{{}\begin{matrix}C_{M\left(NaCl\right)}=\dfrac{0,8}{0,5}=1,6M\\C_{M\left(NaClO\right)}=\dfrac{0,8}{0,5}=1,6M\\C_{M\left(NaOH\right)}=\dfrac{2-1,6}{0,5}=0,8M\end{matrix}\right.\)
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Bài 1.
a)Gia tốc vật: \(a=\dfrac{F}{m}=\dfrac{0,2}{0,1}=2\)m/s2
Vận tốc vật: \(v^2-v^2_0=2aS\)
\(\Rightarrow v=\sqrt{2aS}=\sqrt{2\cdot2\cdot10}=\sqrt{40}\approx6,3\)m/s
b)Với \(v'=10\)m/s thì gia tốc vật là:
\(a'=\dfrac{v'^2-v^2_0}{2S}=\dfrac{10^2-0}{2\cdot10}=5\)m/s2
Lực kéo lúc này: \(F'=m\cdot a'=0,1\cdot5=0,5N\)
Công của lực kéo F là:
\(A=F'\cdot s=0,5\cdot10=5J\)
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nH2SO4=0,045mol nKOH=0,03
PT: X + H2SO4 ==> XSO4 + H2 (1)
H2SO4 + 2KOH ==> K2SO4 + 2H2O (2)
Từ 1 --> nH2SO4 dư = 0,015
--> nX=nH2SO4 pứ= 0,045-0,015=0,03
MX=1,2:0,03=40 --> X là Ca
1 I will be helped by Adam
2 I will be helped with money by him
3 A new phone will be bought by Jenny
4 THe toy will be broken by the baby
5 Will the food be cooked by him
6 The watch won't be stolen by him
7 Why will the bill be paid by him?
8 What will be had for breakfast by you?
9 Her cloth won't be ironed by her
10 THe letter won't be posted by Jack
11 Why will these papers be signed by her?
12 The train will be caught by us
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