a) ${\left(\frac{1}{2}\right)}^m=\frac{1}{32}$

\(\Rightarrow\left(\dfrac{1}{2}\right)^m=\left(\dfrac{1}{2}\right)^5\Rightarrow m=5\)

b)

$\frac{343}{125}={\left(\frac{7}{5}\right)}^n$

\(\Rightarrow\left(\dfrac{7}{5}\right)^3=\left(\dfrac{7}{5}\right)^n\Rightarrow n=3\)

goi so hang thu nhat la x 
goi so hang thu hai la y 
tong hai so la 678 nan ta co pt: x+ y = 678 
tang so thu nhat 56 dv => so thu nhat moi : x + 56 
giam so thu hai 39 dv => so thu hai moi : y - 39 
==>tong cau hai so moi la : x + 56 + y - 39 = x + y + 17 = 678 + 17 = 695

\(\left(\dfrac{-1}{3}\right)^4=\dfrac{1}{81}\) ; \(\left(-0,2\right)^2=0,04\)

1.There is a magazine on the table.

The magazine is on the table.

2.Lan is Hung's younger sister

Hung is Lan's elder/older brother.

3.Mai is Mrs.Hong's daughter

Mrs.Hong is Mai's mother.

4.The weather today is very nice

What a nice weather !

5.These books are very interesting

What interesting books!

A.teenage B.shortage C.message D.passage

Vì chất " Dạ quang " có khả năng phát ra ánh sáng nên vào ban đêm chúng ta có thể xem đồng hồ một cách dễ dàng

1. His address is at 12 Tran Hung Dao street . He lives with his parents => bỏ

2. My father takes care for children in the hospital => of

điểm gì zậy bạn