x + 70 = 70 + 30

x + 70 = 100

x = 100 - 70

x = 30

K mk nha

Mk k bạn 1 cái rùi đó

x + 70 = 70 + 30

x + 70 = 100

       x  = 100 - 70

       x  = 30

tk mk mk tk lại

=838 nha bn

40+30+50+70+8+65+12+30+40+10+483=838

a) 86 – 16 = 70 

b) 23 x 2 – 1 = 23 

c) 250 : 5 + 5 = 25 

d) 40 + 80 : 4 = 30 

e) 80 + 4 : 2 = 42 

f) 70 + 30 : 2 = 50 

g) 90 + 30 x 3 = 180 

h) 70 + 30 : 2 = 85 

x + 60 = 70 + 30

x + 60 = 130

x=  130 - 60

x = 70

K mk nha

x + 60 = 70 + 30

x + 60 = 100

        x = 100 - 60

        x = 40

tk mk mk tk lại

x + 60 = 30 + 70

x + 60 = 100

x        = 100 - 60 

x        = 40

x+60=30+70

x+60=100

x=100-60

x=40

k mk nhe

x + 100 = 70 + 30

x + 100 = 100

          x = 100 - 100

         x = 0

mik nhah nhất đó

x+100=70+30

x+100=100

x=100-100

x=0

10 + 30 + 70 + 20 + 40 x 0

= 10 + 30 + 70 + 20 + 0

= 130

Tk mk nha!

10 + 30 +70 + 20 + 40 x 0 = 0

x + 70 = 3 0 x 3

x + 70 = 90

x        = 90 - 70

x        = 20

x + 70 = 30 x 3

x + 70 = 90

        x = 90 - 70

        x = 20

tk mk mk tk lại

a) 417 – (37 – 20) = 417 – 17

                   = 400

b) 826 – (70 + 30) = 826 – 100

                   = 726

c) 148 : (4 : 2) = 148 : 2

                   = 4

d) ( 30 + 20) x 5 = 50 x 5

                   = 250