Giúp e bài 2,3 vs ah
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DT
Đỗ Thanh Hải
CTVVIP
14 tháng 7 2021
IV
1 do
2 to be
3 was waiting
4 went - wouldn't be
5 were
6 smoking
7 is always leaving
8 to study
9 haven't spoken
10 arrive
V
1 wealthy
2 imagination
3 literately
4 phýical
5 observation
6 Married
7 behavior
8 incredible
9 seniority
10 unbelievable
14 tháng 7 2021
IV
1 do
2 to be
3 was waiting
4 went - wouldn't be
5 were
6 smoking
7 is always leaving
8 to study
9 haven't spoken
10 arrive
V
1 wealthy
2 imagination
3 literately
4 physical
5 observation
6 Married
7 behavior
8 incredible
9 seniority
10 unbelievable
KY
14 tháng 7 2021
I wish the council wasn't demolishing it
If I were good at English, I could become a tour guide
"I will hold an event about skin care next month" Mary said
She was given the book " The fault in our stars " as a birthday gift by him
He wishes he could come to his brother's wedding
He advised me not to longer spend most of time chatting on Facebook.
How long did you start searching for some facts in the past ?
My mother used to for me when I married my wife
She was so frightened that she lost control of her car.
It was such a delicious dessert that I decided to order portion
Because of my sickness, I don't go out
10 tháng 8 2021
bài 2
a) ĐKXĐ: a\(\ge\)0, a\(\ne\)1
b)P=\(\dfrac{1+\sqrt{a}-1+\sqrt{a}}{\left(1-\sqrt{a}\right)\left(1+\sqrt{a}\right)}\).\(\dfrac{1+\sqrt{a}}{\sqrt{a}}\)
P=\(\dfrac{2\sqrt{a}}{\left(1-\sqrt{a}\right)\left(1+\sqrt{a}\right)}.\dfrac{1+\sqrt{a}}{\sqrt{a}}\)
P=\(\dfrac{2}{1-\sqrt{a}}\)
c) thay a=4 vào biểu thức ta có
P=\(\dfrac{2}{1-\sqrt{4}}\)=\(\dfrac{2}{1-2}\)=-2
d) để P=9 thì
\(\dfrac{2}{1-\sqrt{a}}=9\)\(\Rightarrow\)2=9(1-\(\sqrt{a}\))
\(\Rightarrow\)2=9-\(9\sqrt{a}\)\(\Rightarrow\)\(9\sqrt{a}=7\)\(\Rightarrow\)\(\sqrt{a}=\dfrac{7}{9}\)
\(\Rightarrow a=\dfrac{49}{81}\)
10 tháng 8 2021
bài 3
a) \(\sqrt{9x^2}=4\Rightarrow3x=4\)\(\Rightarrow\)\(x=\dfrac{4}{3}\)
b)\(\Rightarrow\)\(\left(x-\sqrt{5}\right)^2\)=0\(\Rightarrow x-\sqrt{5}=0\)
\(\Rightarrow x=\sqrt{5}\)
11 tháng 11 2021
a: \(\left\{{}\begin{matrix}3x+6y=4\\x+4y=2\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=\dfrac{1}{3}\\x=\dfrac{2}{3}\end{matrix}\right.\)
