1)   \(152\times9+152\times1=152\times\left(9+1\right)=152\times10=1520\)

2)    \(24\times999+24\times1=24\times\left(999+1\right)=24\times1000=24000\)

1/ 152 x 9 + 152 x 1 = 152 x ( 9 + 1 ) = 152 x 10 = 1520

2/ 24 x 999 + 24 x 1 = 24 x ( 999 + 1 ) = 24 x 1000 = 24000

177 097          70 079                        15 445                        321

\(\frac{2}{3}=\frac{2.6}{3.6}=\frac{12}{18}\)

\(\frac{14}{56}=\frac{14:14}{56:14}=\frac{1}{4}\)

\(\frac{24}{36}=\frac{24:3}{36:3}=\frac{8}{12}\)

\(\frac{x}{152}=\frac{2}{5}\Rightarrow x.5=2.152\Rightarrow x.5=304\Rightarrow x=304:5=60,8\)

a)\(\frac{2}{3}=\frac{12}{x}\Rightarrow12\times3=2x\)

=>36=2x

=>x=18

b)\(\frac{14}{56}=\frac{1}{4}=\frac{1}{x}\Rightarrow4=x\)

=>x=4

c)\(\frac{24}{36}=\frac{2}{3}=\frac{x}{12}\Rightarrow12\times2=3x\)

=>24=3x

=>x=8

d)\(\frac{x}{152}=\frac{2}{5}\Rightarrow2\times152=5x\)

=>304=5x

=>x=\(\frac{304}{5}\)

a} 12/18=12/x

=> x=18

b}14/56=14/14x

=> 14x=56

=> x=56:14=4

c}24/36=3x/36

=> 3x=24

=> x=24:3

=> x=8

d} ko tồn tại vì 152 ko chia hết cho 5    

152 399 + 24 457 = 176 856

6992 508 – 22 384 = 6 970 124

429 089 x 5 = 2 145 445

143 263 : 9 = 15 918 dư 1

-152-(3x+1)=-2.(-77)

-152-(3x+1)=154

3x+1 = 154 + 152

3x + 1 = 306

3x = 306 - 1

3x = 305

x = \(\frac{305}{3}\)

Trả lời :

- 152 - ( 3x + 1 ) = - 2 . ( - 77 )

- 152 - ( 3x + 1 ) = 154

=> 3x - 1 = ( - 152 ) - 154

=> 3x - 1 = - 306

3x = - 306 + 1

3x = - 305

=> x = - 305 : 3

x = \(\frac{-305}{3}\)

Vậy x = \(\frac{-305}{3}\)