Question

[VICTOR_ICHIGO]

a)40 * x=1440

b)x:13=205

c)2057

d)tính bằng cách thuạn tiện nhất:

36 x 25 x 4=?

18x24:9=?

41 x 2 x 8 x 5=?

215 x 86 + 215 x 14=?

53 x 128 - 43 x 128=?

2/3 x 4/7=?

2 x 3 x 4 / 2 x 3 x 4 x 5=?

1 x 2 x 3 x 4 / 5 x 6 x 7 x 8

x : 7/11=22

2/7 * x=2/3

Answer 1

[BOY 7A1]

ghi nhiều quá

Answer 2

[VICTOR_ICHIGO]

a)1440:40 =36

b)205 x 13 =2665

c)2057

d)36 x 25 x 4 =3600

18 x 24 :9 =48

41 x 2 x 8 x 5 =3280

215 x 86 + 215 x 14 =21500

53 x 128 - 43 x 128 =1408

2/3 x 4/7 =8/21

2 x 3 x 4 / 2 x 3 x 4 x 5 =24/120

1 x 2 x 3 x 4  / 5 x 6 x 7 x 8=24/1680

x : 7/11 = 22

          x =22 x 7/11

          x =14

2/7 * x =2/3 

         x = 2/7 :2/3

         x = 20/21