a [(2 /3-1 /4)+(-2)^2.3]1 b.1,5-12.[0.09.1/2+(2/5)^2-25]

1 bình luận về “a [(2 /3-1 /4)+(-2)^2.3]1 b.1,5-12.[0.09.1/2+(2/5)^2-25]”

1. a [(2 /3-1 /4)+(-2)^2 xx 3]-1

   = [8/12 – 3/12 + 4 xx 3 ]-1

    = [ 5/12 + 12 ] – 1

   = 149/12 – 1

   = 137/12

   b.1,5-12.[0,09.1/2+(2/5)^2-25]

   = 1,5-12.[0,09.1/2+(2/5)^2-25]  

   = 3/2 – 12 . [ 9/100 . 1/2 + 4/25 – 25 ]

   = 3/2 – 12 . [ 45/1000 + 4/25 – 25 ]

   = 3/2 – 12 . [ 0,205 – 25 ]

   = 3/2 – 12 . ( -24,795 )

   = 3/2 + 297,54 ( đổi dấu ”–” = ”+” )

   = 299,04

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