Question

[Pham Trong Bach]

Tìm x

a) X + 15 = 20        b) X – 18 = 16        c) 72 – x = 50

 

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d) X x 7 = 42        e) X : 7 = 5        f) 49 : x = 7

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Answer 1

[Cao Minh Tâm]

a) X + 15 = 20

       X = 20 – 15

       X = 5

 

b) X – 18 = 16

       X = 16 + 18

       X = 34

c) 72 – x = 50

       X = 72 -50

       X =22

d) X x 7 = 42

       X= 42 : 7

       X = 6

e) X : 7 = 5

       X = 5 x 7

       X = 35

f) 49 : x = 7

       X = 49: 7

       X = 7