Share
Giúp mk vs ạ cảm ơn các bn nhìu
Question
Leave an answer
Doris
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Answers ( )
Bài 1:
a) 38 + 41 + 117 + 159 + 62
= (38 + 62) + (41 + 159) + 117
= 100 + 200 + 117
= 417
b) 73 + 86 + 968 + 914 + 3032
= (86 + 914) + (968 + 3032) + 73
= 1000 + 4000 + 73
= 5073
c) 341 x 67 + 341 x 16 + 659 x 83
= 341 x (67 + 16) + (659 x 83)
= 341 x 83 + 54697
= 28303 + 54697
= 83000
d) 42 x 53 + 47 x 156 + 47 x 114
= (42 x 53) + 47 x (156 + 114)
= 2226 + 47 x 270
= 2226 + 12690
= 14916
Bài 2:
a) 6x – 5 = 613
6x = 613 + 5
6x = 618
x = 618 : 6
x = 103
b) (x – 47) – 115 = 0
(x – 47) = 0 + 115
x – 47 = 115
x = 115 + 47
x = 162
c) 315 + (146 – x) = 401
(146 – x) = 401 – 315
146 – x = 86
x = 146 – 86
x = 60
d) 575 – (6x + 70) = 445
(6x + 70) = 575 – 445
6x + 70 = 130
6x = 130 – 70
6x = 60
x = 60 : 6
x = 10
f) (x – 105) : 21 = 15
(x – 105) = 15 x 21
x – 105 = 315
x = 315 + 105
x = 420
l) 0 x (2020 – x) = 0
(2020 – x) = 0 : 0
2020 – x = 0
x = 2020 – 0
x = 2020
g) 2448 : [119 – (x – 6)] = 24
[119 – (x – 6)] = 2448 : 24
119 – (x – 6) = 102
(x – 6) = 119 – 102
x – 6 = 17
x = 17 + 6
x = 23