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

0 bình luận về “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”

1. #The best of team

   học tốt :333

   xin ctlhn :>

   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

   câu g sai đề nên mk ko lm đc :<

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2. 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` 

   g) ( x – 30 ) :2 (sai đề)

   XIN HAY NHẤT Ạ

    

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