a) 125 x 25 x 64

= ( 25 x 64 ) x 125

= 1600 x 125 

= 200 000

b) 125 x 25 x 12 x 14

=  ( 125 x 12 ) x ( 25 x 14 )

= 1500 x 350

= 525000

c) 1300 : 50 = 26

d) 700 : 25 = 28

a, = 125 x (25x64)=125 x 1600= 200 000

b, = (125 x 24) x ( 25 x 12) = 3000 x 300 = 900 000

c, 1300 : 50 = 26

d, 700 : 25 = 28.

a) 125 × 25 × 64 

= 125 × ( 25 × 64 ) 

= 125 × 1600 

= 200 000

b) 125 × 25 × 12 × 24 

= ( 125 × 12 ) × ( 25 × 24 ) 

= 1 500 × 600 

= 900 000 

c) 1300 : 50 

= 13 × 100 : 50 

= 13 × ( 100 : 50 ) 

= 13 × 2 

= 26

d) 700 : 25 

= 7 × 100 : 25

= 7 × ( 100 : 25 ) 

= 7 × 4 

= 28

A, 1125 - ( 347 + 1125 ) + ( -65 +347 )

= 1125 - 347 -1125 +  ( -65 ) +347

= ( 1125 -1125 )+(  347 - 347 ) + ( -65 )

=         0         +        0 +          ( -65 ) 

= -65

b, -23 . 63 + 23 . 21 - 58

= -23 .  ( - 1 ) . 63 + 23 . 21 - 58

=  23 . ( -63 ) + 23 . 21 - 58 

= 23 . ( -63 ) + 23 . ( -37 )

= 23 . [ ( -63 ) + ( -37 ) ]

= 23 . ( -100 )

= - 2300.

c, - 2003 + ( -21 + 75 + 2003 )

= 2003 + ( -21 ) + 75 + 2003 

= 2003 . 2 + [ ( -21 ) + 75 ]

= 4006 + 54 

= 4060 

Tick mình nha bạn yêu

khó

kho

= 0,54 + 0,24 + 0,12 + 0,1 

= 1

\(\dfrac{27}{50}+\dfrac{24}{100}+0,12+10\%\)
\(=\dfrac{27}{50}+\dfrac{12}{50}+\dfrac{6}{50}+\dfrac{5}{50}\)
\(=\dfrac{50}{50}=1\)

`27/50+24/100+0,12+10%`

`=27/50+6/25+3/25+1/10`

`=(27/50+1/10)+(6/25+3/25)`

`=(27/50+5/50)+9/25`

`=32/50+9/25`

`=16/25+9/25`

`=25/25=1`

A=\(\dfrac{1313}{2121}\)*\(\dfrac{165165}{143143}\)*\(\dfrac{424242}{151515}\)

A=\(\dfrac{13}{3\cdot7}\)*\(\dfrac{3\cdot5}{13}\)*\(\dfrac{2\cdot7}{5}\)

A=\(\dfrac{13}{21}\)*\(\dfrac{15}{13}\)*\(\dfrac{14}{5}\)

A=\(\dfrac{13\cdot3\cdot5\cdot2\cdot7}{3\cdot7\cdot13\cdot5}\)

A= 2

7x = 4y nên \(\frac{y}{\frac{1}{4}}=\frac{x}{\frac{1}{7}}=\frac{y-x}{\frac{1}{4}-\frac{1}{7}}=\frac{24}{\frac{3}{28}}=224\)=> x = 224 : 7 = 32 ; y = 224 : 4 = 56

7x=4y => y/7 = x/4

ap dung day ty so = nhau ta co;

(y-x) /(7-4) = 24/3 =8

x= 4.8 = 32

y = 7.8 = 56

Theo mình thì bạn Phan Thanh Tịnh làm đúng đó!

\(\left(24-x\right)^3=64\)

\(\Rightarrow\left(24-x\right)^3=4^3\)

\(\Rightarrow24-x=4\)

\(\Rightarrow x=24-4\)

\(\Rightarrow x=20\)

\(\left(24-x\right)^3=64\)

\(\Rightarrow\left(24-x\right)^3=4^3\)

\(\Rightarrow24-x=4\)

\(\Rightarrow x=24-4\)

\(\Rightarrow x=20\)

Vậy: \(x=20\).