6.23

a)\(\dfrac{-5}{3}\) - \(\dfrac{-7}{3}\)

=\(\dfrac{-5-\left(-7\right)}{3}\)

=\(\dfrac{2}{3}\)

b)\(\dfrac{5}{6}\)- \(\dfrac{8}{9}\) 

=\(\dfrac{5.3}{6.3}\)- \(\dfrac{8.2}{9.2}\)

=\(\dfrac{15}{18}\)-\(\dfrac{16}{18}\)

=\(\dfrac{-1}{18}\)

6.24 

A=(-\(\dfrac{3}{11}\)) + \(\dfrac{11}{8}\) - \(\dfrac{3}{8}\) + (-\(\dfrac{8}{11}\))

= [ (-\(\dfrac{3}{11}\)) +  (-\(\dfrac{8}{11}\)) ] + ( \(\dfrac{11}{8}\) - \(\dfrac{3}{8}\) )

=\(\dfrac{-11}{11}\) + \(\dfrac{8}{8}\)

= -1 + 1

=0

Tổng phần lương đã chi tiêu và mua quà là:
\(\dfrac{2}{5}\) + \(\dfrac{1}{4}\) = \(\dfrac{8}{20}\) + \(\dfrac{5}{20}\)=\(\dfrac{13}{20}\)

Phần tiền lương còn lại :

1 - \(\dfrac{13}{20}\) = \(\dfrac{20}{20}\) - \(\dfrac{13}{20}\) = \(\dfrac{7}{20}\)

C1 = 7,5 : 0,75 = 10

C2 = 6.24 :0,75 + 1.26 : 0.75 =10

6.24:

\(A=\dfrac{-3}{11}-\dfrac{8}{11}+\dfrac{11}{8}-\dfrac{3}{8}=-1+1=0\)

6.23

a: \(=\dfrac{-5-7}{3}=\dfrac{-12}{3}=-4\)

b: \(=\dfrac{45-72}{54}=\dfrac{-27}{54}=-\dfrac{1}{2}\)

 B1a)2/3             b)-1/18

\(\dfrac{9^4.2^{15}}{2^6.24^3}\) = \(\dfrac{9^4.2^9}{24^3}\) = \(\dfrac{2^9.3^8}{2^9.3^3}\) = 3⁵ = 243

\(\dfrac{9^4\cdot2^{15}}{2^6\cdot24^3}=\dfrac{\left(3^2\right)^4\cdot2^{15}}{2^6\cdot\left(8\cdot3\right)^3}=\dfrac{3^8\cdot2^{15}}{2^6\cdot8^3\cdot3^3}=\dfrac{3^8\cdot2^{15}}{2^6\cdot2^9\cdot3^3}=\dfrac{3^8\cdot2^{15}}{2^{15}\cdot3^3}=3^5=243\)

\(\dfrac{9^4.2^{15}}{2^6.24^3}=\dfrac{3^8.2^{15}}{2^6.3^3.2^9}=3^5\)

no

bài 1 hình 3,10 là hình chi rx bn

1) pen 

2) book 

3)baby

4)pig

5)bee

6)ball

7)parent

8)bed

9)pizza

10)bean

11)bus

12)piano

mn ơi giúp mìnhhhhhh

các bn ơi giúp mình vớiiiii

cần rất gấp ạ T^T 

mn ơi ai giỏi tiếng anh thì giúp mình với ạ 

sao mn ko có ai giúp mình vậy 

1) are eatting ....

2)are talking...

3)Ha is writing...

4)are playing...

5)is drawing...

4)

mn ơi mn giúp mình với ạ

1) Are your friend swimming 

yes, it is

2)Are they listen to music

yes, they are