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36. Bob has never seen this movie before.
39 Have you received any letter from your parents yet?
43. People plant trees in public areas.
44. I didn't go to school because it rained heavily yesterday.
45. How long have you studied at school?
Bài 30:
a: Xét ΔDEI và ΔDFI có
DE=DF
DI chung
EI=FI
Do đó: ΔDEI=ΔDFI
18 Debra visited the castle. She visted the museum,too
19 We have got nothing for food
20 She may not ring after all
22 Was this book borrowed by you?
23 The house on the corner is bigger than ours
24 I have never read such an amusing thing
26 She refused to marry John
3: \(\left(3x+5\right)\left(2x-7\right)\)
\(=6x^2-21x+10x-35\)
\(=6x^2-11x-35\)
4: \(\left(5x-2\right)\left(3x+4\right)\)
\(=15x^2+20x-6x-8\)
\(=15x^2+14x-8\)
1: \(\Leftrightarrow x-2-7x+7=-1\)
=>-6x+5=-1
hay x=1(loại)
3: \(\Leftrightarrow\left(x+2\right)\left(x-1\right)-\left(x+1\right)\left(x+3\right)=4\)
\(\Leftrightarrow x^2+x-2-x^2-4x-3=4\)
=>-3x=9
hay x=-3(loại)
4: \(\Leftrightarrow x^2+2x+1-x^2+2x-1=3x\cdot\dfrac{x+1-x+1}{x+1}\)
\(\Leftrightarrow4x=\dfrac{6x}{x+1}\)
\(\Leftrightarrow4x^2+4x-6x=0\)
\(\Leftrightarrow4x^2-2x=0\)
=>2x(2x-1)=0
hay \(x\in\left\{0;\dfrac{1}{2}\right\}\)
6 street
7 elderly
8 blind
9 homeless
10 deaf
11 sick
12 rich
13 disabled
14 poor
15 dumb