Question

[Pham Trong Bach]

Tìm x

a) 12 : x = 3       b) 21 : x = 7       c) 30 : x = 3

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d) X : 7 = 4       e) 20 : x = 5       f) X x 6 = 42

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Answer 1

[Cao Minh Tâm]

a) 12 : x = 3

     X = 12 : 3

     X = 4

b) 21 : x = 7

     X = 21 : 7

     X = 3

c) 30 : x = 3

     X = 30 : 3

     X = 10

d) X : 7 = 4

     X = 4 x 7

     X = 28

e) 20 : x = 5

     X = 20 : 5

     X = 4

f) X x 6 = 42

     X = 42 : 6

     X = 7