Question

Thực hiện các phép tính sau bằng một cách hợp lí:

a)37 + 41 + 117 + 159 + 62              e)563 . 23 + 23 . 36 + 23

b)73 + 86 + 968 + 914 + 3032          f)132 + 157 + 43 + 68

c)341 . 67 + 341 . 16 + 659 . 83       g)49 . 68 + 100 . 34 + 68

d)42 . 53 + 47 . 156 - 47 . 114          h)491 . (267 + 53) + 491 . (151 + 67)

Mình cần gấp

Answer 1

a)38 + 41 + 117 + 159 + 62 

= ( 38 + 62 ) + ( 41 + 159 ) + 117

= 100 + 200 + 117

= 300 + 117 = 417

b)73 + 86 + 968 + 914 + 3032

= ( 968 + 3032 ) + ( 86 + 914 ) + 73

= 4000 + 1000 + 73

= 5000 + 73 = 5073

c)341 . 67 + 341 . 16 + 659 . 83 

= 341 .  ( 67 + 16 ) + 659 . 83

= 341 . 83 + 659 . 83

= 83 . ( 341 + 659 )

= 83 . 1000

= 83000

d)42 . 53 + 47 . 156 - 47 . 114  

= 42 . 53 + 47 . ( 156 - 114 )

= 42 . 53 + 47 . 42

= 42 . ( 53 + 47 )

= 42 . 100

= 4200

e)563 . 23 + 23 . 36 + 23

= 23 . ( 563 + 36 + 1 )

= 23 . 600

= 13800

f)132 + 157 + 43 + 68

= ( 132 + 68 )  + ( 157 + 43 )

= 200 + 200

= 400

g)49 . 68 + 100 . 34 + 68

= 49 . 68 + 50. 2 . 34 + 68

= 49. 68 + 50 . 68 + 68

= 68 . ( 49 + 50 + 1 )

= 68 . 100

= 6800

h)491 . (267 + 53) - 491 . (153 + 67)

= 491 . 267 + 491 . 53 - 491 . 153 - 491 . 67

= 491 . ( 267 + 53 - 153 - 67 )

= 491 . 100

= 49100

Answer 2

Trả lời:

a) 38 + 41 + 117 + 159 + 62 = ( 38 + 62 ) + ( 41 + 159 ) + 117 = 100 + 200 + 117 = 417

b) 73 + 86 + 968 + 914 + 3032 = 73 + ( 86 + 914 ) + ( 968 + 3032 ) = 73 + 1000 + 4000 = 5073

c) 341 . 67 + 341 . 16 + 659 . 83 = 341 . ( 67 + 16 ) + 659 . 83 = 341 . 83 + 659 . 83 = 83 . ( 341 + 659 ) = 83 . 1000 = 83000    

d) 42 . 53 + 47 . 156 - 47 . 114 = 42 . 53 + 47 . ( 156 - 114 ) = 42 . 53 + 47 . 42 = 42 . ( 53 + 47 ) = 42 . 100 = 4200         

e) 563 . 23 + 23 . 36 + 23 = 23 . ( 563 + 36 + 1 ) = 23 . 600 = 13800

f) 132 + 157 + 43 + 68 = ( 132 + 68 ) + ( 157 + 43 ) = 200 + 200 = 400

g) 49 . 68 + 100 . 34 + 68 = 49 . 68 + 50 . 2 . 34 + 68 = 49 . 68 + 50 . 68 + 68 = 68 . ( 49 + 50 + 1 ) = 68 . 100 = 6800

h) 491 . (267 + 53) - 491 . (153 + 67) = 491 . [ ( 267 + 53 ) - (153 + 67 ) ] = 491 . ( 267 + 53 - 153 - 67 ) = 491 . 100 = 49100