1. 1 1/6 . 2^2 – 0,5: 3/10 + 3/4 2.tìm x: x – 2/3 = -7/15 4/9 . 7/12 . x = 1/3

2 bình luận về “1. 1 1/6 . 2^2 – 0,5: 3/10 + 3/4 2.tìm x: x – 2/3 = -7/15 4/9 . 7/12 . x = 1/3”

1. 1)

   1 1/6×2^2-0,5:3/10+3/4

   =7/6×4-1/2×10/3+3/4

   =14/3-5/3+3/4

   =3+3/4

   =15/4

   2)

   x-2/3=-7/15

   x=-7/15+2/3

   x=1/5

   Vậy x=1/5

   —-

   4/9×7/12×x=1/3

   7/12×x=1/3:4/9

   7/12×x=3/4

   x=3/4:7/12

   x=9/7

   Vậy x=9/7

   Trả lời
2. Bài 1:

   1 1/6 * 2^2 – 0,5 : 3/10 + 3/4

   = 7/6 * 4 – 1/2 * 10/3 + 3/4

   = 14/3 – 5/3 + 3/4

   = 3 + 3/4

   = 12/4 + 3/4

   = 15/4

   Bài 2:

   x – 2/3 = (-7)/15

   => x = (-7)/15 + 2/3

   => x = (-7)/15 + 10/15

   => x = 1/5

   Vậy x = 1/5

   ———-

   4/9 * 7/12 * x = 1/3

   => 7/27 * x = 1/3

   => x = 1/3 : 7/27

   => x = 1/3 * 27/7

   => x = 9/7

   Vậy x = 9/7

   $# ????????????????????$

   Trả lời