Question

Tìm x:

a, 89 - ( 73-x ) = 20

b, 140 : ( x-8 ) = 7

Answer 1

a) 89 - (73 - x) = 20

73 - x = 89 - 20 = 69

x = 73 - 69 = 4

b) 140 : (x-8) = 7

x - 8  = 140 : 7 = 2

x = 8 + 2 = 10

Answer 2

\(a,89-\left(73-x\right)=20\\ 73-x=69\\ x=4\\ b,140:\left(x-8\right)=7\\ x-8=20\\ x=28\)

Answer 3

a: x=4

b: x=28

Answer 4

a) 89-(73-x)=20
         73-x= 89-20
         73-x=69
              x=73-69

              x= 4

b) 140:(x-8)=7

            x-8=140:7
            x-8=20
            x   = 20+8
            x   = 28

Answer 5

a, 89 - ( 73-x ) = 20

<=> 73 + x = 89 - 20

<=> 73 + x =  69

<=> x = 73 - 69

=> x = 4

b, 140 : ( x-8 ) = 7

<=> x - 8 = 140 : 7 

<=> x - 8 = 20

<=> x = 20 + 8

=> x = 28