Bài 1: Tìm x: A)x-3/4=7/12 B)x+3/4=5/6 C)x:2/5=3/10 D)x nhân 8/9=2/3

2 bình luận về “Bài 1: Tìm x: A)x-3/4=7/12 B)x+3/4=5/6 C)x:2/5=3/10 D)x nhân 8/9=2/3”

1. a) x – 3/4 = 7/12

                x = 7/12 + 3/4

               x = 7/12 + 9/12

                x = (7 + 9)/12

               x = 16/12 = 4/3

   Vậy x = 4/3

   __________________________________-

   x + 3/4 = 5/6

             x = 5/6 – 3/4

             x = 10/12 – 9/12

             x = (10 – 9)/12

             x = 1/12

   Vậy x = 1/12

   _____________________________________

   x : 2/5 = 3/10

           x = 3/10 xx 2/5

           x = (3 xx 2)/(10 xx 5)

           x = 6/50 = 3/25

   Vậy x = 3/25

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   x xx 8/9 = 2/3

              x = 2/3 : 8/9

              x = 2/3 xx 9/8

              x = (2 xx 9)/(3 xx 8)

              x = 18/24 = 3/4

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   Trả lời
2. Bài 1:

   a) x – 3/4 = 7/12

   x = 7/12 + 3/4

   x = 7/12 + 9/12

   x = 4/3

   ———–

   b) x + 3/4 = 5/6

   x = 5/6 – 3/4

   x = 10/12 – 9/12

   x = 1/12

   ———-

   c) x : 2/5 = 3/10

   x = 3/10 xx 2/5

   x = 3/25

   ———

   d) x xx 8/9 = 2/3

   x = 2/3 : 8/9

   x = 2/3 xx 9/8

   x = 3/4

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   Trả lời