8, A

9, D

A

D

has more homework than me
the weather was bad, many people still came to join the Book Fair
is terrifying to watch this horror film 
How often should you have a medical checkup?
Why doesn't she eat meat?

Kết bài gì vậy???

kết bài đề gì chứ

Bài 1:

b: \(2^3\cdot3^2\cdot2005^0=8\cdot9\cdot1=72\)

c: \(4\cdot5^2-3\cdot2^2\)

\(=4\cdot25-3\cdot8\)

=100-24

=76

d: \(\left\lbrack595-\left(25+4\cdot40\right)\right\rbrack:10-1000:25\)

=[595-25-160]:10-40

=[570-160]:10-40

=410:10-40

=41-40

=1

e: \(1440-\left\lbrack\left(216+184\right):4\right\rbrack\cdot9\)

\(=1440-\frac{400}{4}\cdot9\)

=1440-900

=540

g: \(194\cdot12+6\cdot437\cdot2+3\cdot369\cdot4\)

\(=12\cdot194+12\cdot437+12\cdot369\)

\(=12\left(194+437+369\right)=12\cdot1000=12000\)

h: \(275+\left(12-4\right)^2\)

\(=275+8^2\)

=275+64

=339

Bài 2:

a: \(6^5:6^3\cdot3\)

\(=6^2\cdot3=36\cdot3=108\)

b: \(7\cdot4^2-45:3^2+13\)

\(=7\cdot16-45:9+13\)

=112+13-5

=125-5

=120

c: \(13\cdot68+32\cdot13-300\)

\(=13\left(68+32\right)-300\)

=1300-300

=1000

Bài 3:

a: 145-(x-25)=75

=>x-25=145-75=70

=>x=70+25

=>x=95

b: 5(x+1)-125=235

=>5(x+1)=125+235=260

=>x+1=52

=>x=52-1=51

c: 243+(x-2)=453

=>x-2=453-243=210

=>x=210+2

=>x=212

d: (x-3)+15=62

=>x-3=62-15=47

=>x=47+3=50

e: \(3^4:3\left(x-1\right)=3^2\)

=>\(3\left(x-1\right)=\frac{3^4}{3^2}=9\)

=>x-1=3

=>x=3+1

=>x=4

g: \(3^{x}\cdot3-25=218\)

=>\(3^{x+1}=218+25=243=3^5\)

=>x+1=5

=>x=4

a.\(0,5m^3=500dm^3\)

\(0,03m^3=30000cm^3\)

\(\dfrac{5}{8}m^3=625dm^3\)

b.\(7623dm^3=7,623m^3\)

\(98000cm^3=0,098m^3\)

\(27,7dm^3=0,0277m^3\)

a) 0,5 m³ = 500 dm³                    b) 7623 dm³ = 7,623 m³
0,03 m³ = 30000 cm³                   98000 cm³ 0,98
\(\dfrac{5}{8}\) m³ = 625 dm³                           27,7 dm³ = 0,277 m³

36D 37A 38D 39A 40C 41B 42A 43D 44A 45C 46B 47 48A 49C 50A

Bài 3: 

a: =>11x=77

hay x=7

b: =>x+12=18

hay x=6