Question

tìm x ;y

a) 15 + x - 5 = 20 

b) y x 5 = 10 x 2

Answer 1

a) 15 + x - 5 = 20

15 + x = 20 + 5

15 + x = 25

x = 25 - 5

x = 20

b) y x 5 = 10 x 2

y x 5 = 20

y = 20 : 5

y = 4

Answer 2

a. x=20+5-15

x=10

b.y x 5=20

y=20/5

y=4

k nhes

Answer 3

a) 15 + x - 5 = 20

    x = 20 + 5 - 15 

x = 10

b) y x 5 = 10 x 2

y x 5 = 20

y = 20 : 5

y= 4

OK

Answer 4

a) 15 + x - 5 = 20 

    15 + x = 20 + 5 

    15 + x = 25 

            x = 25 - 15 

            x = 10

b) y x 5 = 10 x 2 

    y x 5 = 20

          y  = 20 : 5 

          y = 4

Answer 5

a, 15 + x = 20 + 5 = 25

x = 25 - 15

x = 10

b, y x 5 = 20

y = 20 : 5 = 4

=> y = 4

Answer 6

a ) 15+x- 5 = 20

             x = 20+5

            x = 25 - 15

           x = 15 

b)  y  x 5 = 10x2 

           x = 20

           x = 20: 5 

          x = 4 

k tớ đi , làm ơn ! 

Answer 7

15+x-5=20

=>x-5=20-15

=>x-5=5

=>x   =5+5

=>x   = 10

yx5=10x2

=>yx5=20

=>y    = 20:5

=>y    =4