3 x 17 = 3 x (10 + 7) = 3 x 10 + 7 x 3 = 30 + 21 = 51

4 x 25 = 4 x (10 + 15) = 4 x 10 + 15 x 4 = 40 + 60 = 100

5 x 12 = 5 x (10 + 2) = 5 x 10 + 5 x 2 = 50 + 10 = 60

ủng hộ nhé

3 x 17 = 3 x ( 10 + 7 ) = 3 x 10 + 3 x 7 = 30 + 21 = 51

4 x 25 = 4 x ( 10 + 15 ) = 4 x 10 + 4 x 15 = 40 + 60 = 100

5 x 12 = 5 x ( 10 + 2 ) = 5 x 10 + 5 x 2 = 50 + 10 = 60

k mk nếu đúng nha bn

x-5=10

x=10+5

x=15

Vậy x=15

X-5=10

X=10+5

X=15

K nhé MN????

x+5=10

x=10-5

x=5

ai k mình mình k lại

x+5=10

    x=10-5

    x=5

10+x=20:5+50

10+x=4+50

10+x=54

x=54-10

X=44

10 +x=54

x=54-10

x=44

a)x=11

b)x=2

c)x=9

a) x-3=8

x=3+8

x=11

b) 5.x=10

x=10:5

x=2

b) x+6=17

x=17-6

x=11

=1000

=125

10 x10x10 = 1000

5x5x5 = 125

1, 

2x + 5 = 19

2x       = 19 - 5

2x       = 14

  x       = 14 : 2

  x        = 7

2,

( 1 - 2x ) + 5 = 10

( 1 - 2x )       = 5

       2x         = 1 - 5

       2x         = -4

         x         = -4 : 2

         x         = -2

1)    2x + 5 = 19

2x = 19 - 5

2x = 14 

x = 14 : 2

x= 7

2)    (1-2x)  + 5 = 10

(1- 2x) = 10 - 5

(1-2x) = 5

2x = 1-5

2x = -4

x= -4 : 2

x = -2

nhanh mk k nha

bai 1

a =5

b=53

bai2

100

100

24

25

two

50 x 20 = 100

10 x 10 = 100

12 x 2 = 24

5 x 5 = 25

one + one = two