a) ( x – 30 ) : 2 = 3 b) 2 . ( x – 30 ) = 8 c) 70 – 2x = 40 d) 70 +2 : x = 80 e) 70 : 2x = 105 g) ( x – 30 ) :2

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Đáp án:

a) ( x – 30 ) : 2 = 3

=x – 30 = 6

= x = 36

b) 2 . ( x – 30 ) = 8

= x – 30 = 4

= x = 34

c) 70 – 2x = 40

= 2x = 30

= x = 15

d) 70 +2 : x = 80

= 2 : x = 10

= x = 1/5

e) 70 : 2x = 105

= 2x = 5/7

= x = 5/14

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