Question

bài 2: tìm x

a)x-7=12

b)9+4.(x-5)=13

c)(x+2)³=64

Answer 1

a/ x - 7 = 12

=> x = 12 + 7 = 19

b/ 9 + 4(x - 5) = 13

=> 4x - 20 = 4

=> 4x = 24

=> x = 6

c/ (x+2)³ = 64

=> x + 2 = 4

=> x = 2

Answer 2

a) x-7=12

     x=12+7

     x=19

b) 9+4.(x-5)=13

       4.(x-5)=13-9

       4.(x-5)=4

          (x-5)=4:4

          (x-5)=1

          x=5+1

            x=6

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Answer 3

a/ x - 7 = 12

=> x = 12 + 7 = 19

b/ 9 + 4(x - 5) = 13

=> 4x - 20 = 4

=> 4x = 24

=> x = 6

c/ (x+2)³ = 64

=> x + 2 = 4

=> x = 2

Answer 4

a,x-7=12

   x    =12+7

   x     =19

b,9+4.(x-5)=13

       4.(x-5)=13-9

       4.(x-5)=4

          x-5  =4:4

          x-5  =1

          x      =1+5

          x      =6

c,(x+2)³=64

   (x+2)³=4³

     x+2  =4

     x      =4-2

     x      =2.