Question

Tìm x :

120 - x + 15 = 45

Answer 1

120-x=45-15

120-x=30

       x=120-30

       x= 90

Answer 2

120-x= 45-15

_____=30

x= 120-30

x=90

Answer 3

120-x+15=45

120-x      =45-15

120-x      =30

      x       =120-30

      x        =90

Answer 4

120-X+15=45

[120+15]-X=45

135-X=45

X=135-45

X=90

Answer 5

120-x+15=45

120-x=45-15

120-x=30

     x=120-30

     x=90

Answer 6

120-x=45-15

120-x=30

x=120-30

x=90

k nha

Answer 7

120-x=45-15

120-x=30

x=120-30

x=90

Answer 8

<=>x+15=120-45

=>x+25=75

=>x=75-25

=>x=50

Answer 9

chết giải sai r`

Answer 10

120 - x= 45 -15=30

x = 120 - 30 =90

Answer 11

X= 45+15=60

X=120-60=60

Answer 12

120 -ích=45-15

120-ích=30

        ích=120-30

        ích=90