dễ thế này mà cũng hỏi à bạn

có mấy câu ko chắc lắm nên sợ ko dám làm

1 Are

2. Does

3.is

4. are

5. Are

6. Does

7. Are

8. doesn't

9 don't

10 am -am

11 Are

a) x⁴ + 4x² = 5

<=>x⁴+4x²-5=0

<=>x⁴+4x²+4-9=0

<=>(x²+2)²-9=0

<=>(x²+2-3)(x²+2+3)=0

<=>(x²-1)(x²+5)=0

<=>(x-1)(x+1)(x²+5)=0

<=>x-1=0 hoặc x+1=0 hoặc x²+5=0

<=>x=1  hoặc   x=-1   hoặc  x=\(-\sqrt{5}\)hoặc x= \(\sqrt{5}\)

Vậy S={1;-1;\(\sqrt{5};-\sqrt{5}\)}

c)c) |x + 2| + |-1| = 3 (1)

Nếu x+2\(\ge0\)<=>x\(\ge\)-2

(1) trở thành :

x+2+|-1|=3

<=>x+2+1=3

<=>x+3=3

<=>x=0 (loại)

Nếu x+2<0 <=>x<-2

(1) trở thành :

-x-2+|-1|=3

<=>-x-2+1=3

<=>-x-1=3

<=>-x=4

<=>x=-4(thỏa mãn )

Vậy S={-4}

vãi mẹ đẹp thật

1. Are you doing the housework at the moment?

2 I am not going on weekend

 3.John's girl friend is wearing a T-Shirt now

4. They like drinking beer or wine

5. Why are you listening to music loudly now?

1: What's Mai's weigh 

-> How much does Mai weight?

-> How heavy is Mai ?

2: Why isn't this TV working now

-> What is reason for?

3: Trung didn't go to school last sunday 

-> Trung was absent at school last Sunday

4: I don't like candies , either

-> Neither like candies

5 : I haven't seen her for 2 weeks

=> It is 2 weeks since I last saw her

1D

2D

3C

4D

5B

6B

7D

8B

9A

10B

\(\frac{x}{7}=\frac{18}{14}\)

=>\(x=18.7:14=9\)

=> x=9

1. They live in a house in NHa Trang.

2. How manystudents are there your class?

3. There is a clock on the wall .

4. His name is Hung  and he is an engineer.