a. 4.5^2-8:2^3 b-45-27+45-(-25) c.-(-115) +300:[888:6+(-118)]

2 bình luận về “a. 4.5^2-8:2^3 b-45-27+45-(-25) c.-(-115) +300:[888:6+(-118)]”

1. a) 4 . 5^2 – 8 : 2^3

   = 4 . 25 – 8 : 8

   = 100 – 1

   = 99

   ———————

   b) (-45)-27+45-(-25)

   = (45-45)-[27+(-25)] 

   = 0 – 2

   = -2

   ———————

   c) -(-115) + 300 : [888 : 6 + (-118)]

   = 115 + 300 : (148-118)

   = 115 + 300 : 30

   = 115 + 10

   = 125

   Trả lời
2. a) 4 . 5^2 – 8 : 2^3

   = 4 . 25 – 8 : 8

   = 100 – 1

   = 99

   __________________________________

   b) -45 – 27 + 45 – (-25)

   = -45 – 27 + 45 + 25

   = (-45 + 45) + (- 27 + 25)

   = 0 + (-2)

   = -2

   ___________________________________

   c) -(-115) + 300 : [888 : 6 + (-118)]

   = 115 + 300 : [148 + (-148)]

   = 115 + 300 : 0

   = 115 + 0

   = 115

   text{#maingoctranthi}

   Trả lời