GIÚP EM VỚI Ạ, EM CẢM ƠN Ạ❤
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11 He asked his daughter what kind of sport were you interested in
12 I asked the neighboor what time your husband left for work
13) You hate watching violent films , don't you ?
14) They have just repaired the street ìn front of my house,haven't they ?
15) The first TV picture wasn't produced by Baird in 1926,did he ?
16) This kind of shoes was bought last year,didn't she
26.
\(\sqrt{\dfrac{-3}{2a^3}}=\sqrt{\dfrac{-3a}{2a^4}}=\dfrac{1}{a^2}\sqrt{\dfrac{-3a}{2}}\)
Đáp án B
28.
\(\sqrt{\dfrac{a^3}{a}}=\sqrt{a^2}=\left|a\right|=-a\)
Đáp án B
Bài 3:
a: \(A=\dfrac{3\left(x+4\right)}{\left(x+4\right)\left(x-4\right)}=\dfrac{3}{x-4}\)
b: Để A nguyên thì \(x-4\in\left\{1;-1;3;-3\right\}\)
hay \(x\in\left\{5;3;7;1\right\}\)
Bài 2:
a: \(=y\left(6x-y\right)\)
b: \(=x\left(y-2\right)+2\left(y-2\right)=\left(y-2\right)\left(x+2\right)\)
c: =(x+2)(x+5)
Câu 1:
Ta có 2x - y = 8 => 2x - y + 9 = 17
Mà 3x + y = 17 => 2x - y + 9 = 3x + y
<=> 9 - y = x + y <=> 9 = x + 2y <=> x = 9 - 2y
Mà 2x - y = 8 => 18 - 4y - y = 8 => 18 - 5y = 8 => y = 2 => x = 5
hơi mờ
Câu 2 :
\(1.Al_2O_3\\ 2.Fe\left(NO_3\right)_3\\ 3.CuCl_2\\ 4.SO_4\)