A] 7+[7/12 – 1/2 +3]-[1/12+5] B]1-{1:[2^3 +1-(-1/2^2)]}

2 bình luận về “A] 7+[7/12 – 1/2 +3]-[1/12+5] B]1-{1:[2^3 +1-(-1/2^2)]}”

1. a) 7+(7/12 – 1/2 + 3)-(1/12+5)

   =7+(7/12 – 6/12 + 36/12)-(1/12+60/12)

   =7+37/12 – 61/12

   = 84/12 +37/12 -61/12

   =5

   b) 1-{1:[2^3 +1-(-1/2^2)]}

   =1−[1:(8+1+1/4)]

   =1-[1:(32/4+4/4+1/4)]

   =1−(1:37/4)

   =1−4/37

   =33/37

   Trả lời
2. a) 7 + (7/12 – 1/2 + 3) – (1/12 + 5)

   = 7 + (7/12 – 6/12 + 36/12) – (1/12 + 60/12)

   = 7 + 37/12 – 61/12

   = 84/12 + 37/12 – 61/12

   = 60/12 = 5

   ————

   b) 1 – {1 : [2^3 + 1 – (- 1/2^2)]}

   = 1 – [1 : (8 + 1 + 1/4)]

   = 1 – [1 : (32/4 + 4/4 + 1/4)]

   = 1 – (1 : 37/4)

   = 1 – 4/37

   = 33/37

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   Trả lời