Question

3x + 2012 = 2015

5x - 12 = 3^2.52

2012 - ( 2013 - x) = 12

2002 : [12+(2x-20)]=91

Answer 1

cac ban oi giup voi

Answer 2

a) Ta có:

3x + 2012 = 2015

3x             = 2015 - 2012

3x             = 3

  x             = 3 : 3

  x             = 1

Vậy x = 1

b) Ta có:

5x - 12 = 3² .52

5x - 12 = 468

5x        = 480

  x        = 96

Vậy x = 96

c) Ta có:

2012 - (2013 - x) = 12

            2013 - x   = 2000

                       x = 13

Vậy x = 13

d) Ta có: 

2002 : [12+(2x-20)] = 91

            12+(2x-20)  = 22

                   2x-20   = 10

                   2x        = 30

                     x        = 15

Vậy x = 15

Answer 3

A) 3X + 2012 = 2015

3X = 2015 - 2012

3X = 3

X = 3 : 3

X = 1

B) 5X - 12=3^2.52

5X - 12 = 9.52

5X - 12 = 468

5X = 468 + 12

5X = 480

X = 480 : 5

X = 96

C) 2012 - ( 2013 - X) = 12

2013 - X = 2012 - 12

2013 - X = 2010

X = 2013 - 2010

X = 3

D) 2002 : [12+(2X-20)]=91

12+(2X-20)= 2002 : 91

12+(2X-20)= 22

2X-20=22-12

2X-20=10

2X=10+20

2X=30

X=30:2

X=15