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
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
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