giup mk voi help me

Question

tìm X:

a)(100+x)*2=1000

b) 20/x=5*2

 

Answer 1

a) (100 + x) * 2 = 1000

         (100 + x) = 1000 : 2 = 500

                    x = 500 - 100

                    x = 400

b) 20 : x = 5 * 2

    20 : x = 10

          x = 20 : 10

          x = 2 

Answer 2

a) (100 + x) * 2 = 1000
     100 + x = 1000 : 2
     100 + x = 500
=>           x = 500-100
=>           x = 400
Vậy x = 400
b) 20 : x = 5 * 2
    20 : x = 10
=>      x = 20 : 10 
=>      x = 2
Vậy x = 2
Good luck for you to study Maths! :D

Answer 3

a) (100 + x) : 2 = 1000

100 + x = 1000 : 2 = 500

x = 500 - 100

x = 400

b) 20 : x = 5 . 2

20 : x = 10

x = 20 : 10

x = 2

Answer 4

a) (100+X)*2=1000

 (100+x)=1000:2=500

x=500-100=400

B) 20:x=5*2

20:x=10

X=20:10

x=2