:D

D

d

Câu 11: A

Câu 12: C

\(\left(-2\dfrac{1}{3}\right)x^2y\times6x^3y^6\)

\(=\left(-\dfrac{7}{3}\times6\right)x^5y^7\)

\(=-14x^5y^7\)

Chọn B

\(-2^1_3x^2y.6x^3y^6\)

\(=-14x^5y^7\)

Chọn B

B.\(-14x^5y^7\)

tư do

lấy cái nào cũng đc mà nếu ko thì hốt sạch nhé

thì gọi là...SỐNG THONG THẢ e nhó

Thi ko giúp !!!

BN ĐÚNG RỒI 

C. Gluxit

Chọn D

1 B => businessman

2 A  => the first inventors

3 C => had been working

4 D => go

5 D=> preventing

6 C => to receive 

7 A => terrible

8 D => had moved

9 A => was awarded

10 A => was interupted

11 B => bỏ

12 C => bỏ, have thành has

13 D => didn't you

14 A => had been running

\(\dfrac{\text{*}}{4}+\dfrac{2}{5}=\dfrac{13}{20}\)

Gọi * là x ta có :

\(\dfrac{x}{4}+\dfrac{2}{5}=\dfrac{13}{20}\)

\(\dfrac{x}{4}=\dfrac{13}{20}-\dfrac{2}{5}\)

\(\dfrac{x}{4}=\dfrac{1}{4}\)

\(x=\dfrac{1}{4}\times4\)

\(x=\dfrac{4}{4}\)

\(x=1\)

Vậy số thích hợp để điền vào dấu * là : \(1\)

1

b

Chọn B