Question

Answer 1

Answer 2

1/ 
a) x +12=18
X= 18-12=6
b) X-21=12
x=12+21=33
c)14-x=14-2
14-x=12
x=14-12=2
d)65-x=48+17
65-x=65
x=65-65
bài 2 tự làm i , y chang bài 1 thoi =)

Answer 3

Câu 1:
a) x + 12 = 12 + 6
    x + 12 = 18
    x         = 18 - 12
    x         = 6
    14 - x = 14 - 2 
    14 - x = 12
           x = 14 - 12
           x = 2
b) x - 21 = 33 - 21 
\(\Rightarrow\) x = 33

65 - x = 48 + 17
65 - x = 65
       x = 65 - 65
       x = 0
Câu 2:
a) x + 25 = 100 - 25
    x + 25 = 75
    x         = 75 - 25
    x         = 50

700 - x = 300 + 200
700 - x = 500
         x = 700 - 500
         x = 200

b) x + 125 = 100 + 125
\(\Rightarrow\) x = 100

x - 48 = 65 - 28
x - 48 = 37
x        = 37 + 48
x        = 85
 

Answer 4

a) x +12=18
X= 18-12=6
b) X-21=12
x=12+21=33
c)14-x=14-2
14-x=12
x=14-12=2
d)65-x=48+17
65-x=65
x=65-65