Question

Tinh bang cach hop li:

a, 47.33 + 47 + 66.47

b, 24.57 + 43.24

c, 387.2694 + 7305.387 + 387

d, 563.78 - 26.563 + 563.48

ai nhanh dc tik :P

Answer 1

a) \(47.33+47+66.47=47.\left(33+1+66\right)=47.100=4700\)

b) \(24.57+43.24=24.\left(57+43\right)=24.100=2400\)

c) \(387.2694+7305.387+387=387.\left(2694+7305+1\right)=387.10000=3870000\)

d) \(563.78-26.563+563.48=563.\left(78-26+48\right)=563.100=56300\)

Answer 2

a. 47.33 + 47 + 66.47

= 47.(33 + 1 + 66)

= 47 . 100

= 4700

b. 24.57 + 43.24

= 24. (57 + 43)

= 24 . 100

= 2400

c. 387 . 2694 + 7305.387 + 387

= 387. (2694 + 7305 + 1)

= 387 . 10000

= 3870000

d. 563 . 78 - 26.563 + 563.48

= 563. (78 - 26 + 48)

= 563 . 100

= 56300

Answer 3

a) 47.33 + 47 + 66.47 = 47 .(33 + 1 + 66)

     = 47 . 100 = 4700

b) 24 . 57 + 43 . 24 = 24.( 57 + 43)

     = 24 . 100 = 2400

c) 387 . 2694 + 7305 .387 . 387 

= 387 . (2694 + 7305 + 1)

= 387 . 10000 = 3870000

d) 563 . 78 - 26.563 + 563.48

= 563.(78 - 26 + 48)

= 563 . 100 = 56300

Answer 4

a/47 . 33 + 47 + 66 . 47

= 47 .  33 + 47 .  1 + 66 . 47

= 47 . ( 33 + 1 + 66 )

= 47 . 100 = 4700

b/ 24 . 57 + 43 . 24

= 24 . ( 57 + 43 )

= 24 . 100

= 2400

c/ 387 . 2694 + 7305 . 387 + 387

= 387  . 2694 + 7305 . 387 + 387 . 1

= 387 . ( 2694 + 7305 + 1 )

= 387 . 10000

= 3870000

d/ 563 . 78 - 26 . 563 + 563 . 48

= 563 . ( 78 - 26 + 48 )

= 563 . 100

= 56300

Answer 5

Tính bằng cách hợp lí : 

a, 47 . 33 + 47 . 66 . 47 

= 47 . 33 + 47 .1 + 66 . 47 

= 47 . ( 33 + 1 + 66 ) 

= 47 . 100

= 4700

b, 24 . 57 + 43 . 24

= 24 .( 57 + 43 )

= 24 . 100

= 2400

c, 387 . 2694 + 7305 . 387 + 387 

= 387 . 2694 +  7305 . 387 + 387 . 1

= 387 . ( 2694 + 7305 + 1 )

= 387 . 10000

= 3 870 000

d, 563 . 78 - 26 . 563 + 563 . 48 

= 563 . ( 78 - 26 + 48 )

= 563 .  100

= 56300