Question

a)      198 – (x + 4) = 120

b)     2(x- 51) = 2.2³ + 20

c)      450 : (x – 19) = 50

4(x – 3) = 7² – 1¹⁰

Answer 1

a)x+4=198-120

   x+4=78

   x    =78-4

   x    =74

b)2(x-51)=36

      x-51 =36:2

      x      =18+51

      x      =69

c)x-19=450:50

  x      =9+19

  x      =28

d)4(x-3)=48

      x-3  =48:4

      x     =12+3

      x     =15

Answer 2

a: \(\Leftrightarrow x+4=78\)

hay x=74

b: \(\Leftrightarrow x-51=2^3+10=18\)

hay x=69

Answer 3

a)      198 – (x + 4) = 120

x+4=198-120

x+4=78

x=78-4

x=74

vậy x=74

b)     2(x- 51) = 2.2³ + 20

2(x- 51) = 2.8 + 20

2(x- 51) = 16 + 20

2(x-51)=36

x-51=36:2

x-5=13

x=13+5

x=18

vậy x=18

c)      450 : (x – 19) = 50

x-19=450:50

x-19=9

x=9+19

x=28

vậy x=28

4(x – 3) = 7² – 1¹⁰

4(x – 3) =49-1

4(x-3)=48

x-3=48:4

x-3=12

x=12+3

x=15

vậy x=15