Bài 3 Tính giá trị biểu thức 2/5+1/2+8/15, 9/20 -8/15*5/12, 4/9+11/8-5/6, 2/6:4/5:7/12; 2/3*3/4+3/2; 9/5-3/4

Bài 3 Tính giá trị biểu thức

2/5+1/2+8/15, 9/20 -8/15*5/12, 4/9+11/8-5/6, 2/6:4/5:7/12; 2/3*3/4+3/2; 9/5-3/4:5/6 ; 7/5*3/4:4/5

2 bình luận về “Bài 3 Tính giá trị biểu thức 2/5+1/2+8/15, 9/20 -8/15*5/12, 4/9+11/8-5/6, 2/6:4/5:7/12; 2/3*3/4+3/2; 9/5-3/4”

  1.    2/5 + 1/2 + 8/15
    = 12/15 + 15/30 + 16/30
    = 243/30
       9/20 – 8/15 x 5/12
    = 9/20 – 2/9
    = 41/180
       4/9 + 11/8 – 5/6
    = 4/9 + 13/24
    = 71/72
      2/6 : 4/5 : 7/12
    = 5/12 : 7/12
    = 5/7
       2/3 x 3/4 + 3/2
    = 1/2 + 3/2
    = 4/2
    = 2
       9/5 – 3/4 : 5/6
    = 9/5 – 9/10
    = 9/10
       7/5 x 3/4 : 4/5
    = 21/20 : 4/5
    = 21/16
       
     

    Trả lời
  2. Giải đáp:
    2/5 + 1/2 + 8/15 = 12/30 + 15/30 + 16/30 = 43/30
    9/20 – 8/15 × 5/12 = 9/20 – 2/9 = 1/10
    4/9 + 11/8 – 5/6 = 131/72 – 5/6 = 71/72
    2/6 ÷ 4/5 ÷ 7/12 = 5/12 ÷ 7/12 = 5/7
    2/3 × 3/4 + 3/2 = 1/2 + 3/2 = 2
    9/5 – 3/4 ÷ 5/6 = 9/5 – 9/10 = 9/10
    7/5 × 3/4 ÷ 4/5 = 21/20 ÷ 4/5 = 21/16
     

    Trả lời

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