Question

tìm x

x+20-70*2=0

Answer 1

x + 20 - 70 x 2 = 0

x + 20 - 140 = 0

x + 20 = 140

x = 140 - 20

x = 120

Answer 2

x + 20 - 70 x 2 = 0

x + 20 - 140     = 0

           x +20      =140

               x          = 140 - 20

              x            = 120

Vậy x = 120

Answer 3

\(x+20-70\cdot2=0\)

\(\Leftrightarrow x+20-140=0\)

\(\Leftrightarrow x=140-20=120\)

Answer 4

x + 20 - 70 . 2 = 0

x + 20 - 140    = 0

x + 20              = 0 + 140

x + 20              = 140

x                       = 140 - 20

x                      = 120

Vậy x = 120

Answer 5

x + 20 - 70 \(\times\)2=0

x + 20 - 140 =0

x + 20 = 140 +0

x+ 20 = 140

    x= 140 - 20

    x= 120

Chúc bạn học tốt ! 

Answer 6

x + 20 - 70 * 2 = 0

x +20 - 140     = 0 

x + 20             = 0 + 140

x + 20             = 140

x                     = 140 - 20

x                     = 120

Vậy x = 120

Answer 7

x+20-70*2=0

=>x+20-140=0

=>x+20=140

=>x=140-20=120