x + 500 = 700

x          = 700 - 500

x          = 200

k mk nha!!!!!!!!

=200

oc vat oc lon oc cho

oc cut oc cu chuoi

x + 20 = 20 + 5

x + 20 = 25 

        x = 25 - 20

       x = 5

ai tk mk mk tk lại

x=5 nhé

x + 20 = 60 - 30

x + 20 = 30

x         = 30 - 20

x         = 10

tk mk mk tk lại

x + 20 = 60 - 30

x + 20 = 30

        x = 30 - 20

        x = 10

Tk mk nha

x + 10 = 20 x 2

x + 10 = 40

x = 40 - 10

x = 30 

x+10=20x2

x+10=40

x=40-10

x=30

x+500=100

x=100-500

x=-400

x + 500  =100 - 500 + 500

x + 500 = -400 + 500

x + 500 = 100

x = 100 - 500

x = -400.

168,69 + 162,1 + 222,31

= (168,69 + 222,31) + 162,1

= 391 + 162,1

= 553,1

168.69+162.1+222.31

=(168.69+222.31)+162.1

=391+162.1

=553.1

tk minh nha

x+40=60

x=60-40

x=20

tk minh nha

x + 40 = 30 x 2

x + 40 = 60

x = 60 - 40

x = 20

Vậy x = 20

x + 40 = 30 x 2

x + 40 = 60

x = 60 - 40

x = 20

Vậy x = 20

x + 40 = 30 x 2

x + 40 = 60

x = 60 - 40

x = 20 

x + 20 = 50 + 50

x + 20 = 100

x         = 100 - 20

x         = 80

Vậy x = 80

x + 20 = 50 + 50

x + 20 = 100

x         = 100 - 20

x         = 80

x + 50 = 80 - 10

x + 50 = 70

       x = 70 - 50

       x = 20

x + 50 = 80 - 10

x + 50 = 70

        x = 70 - 50

        x = 20

tk mk mk tk lại