Question

Bài 2 : Tính :

a) 24 . 5 - \(\left[131.\left(13-4\right)^2\right]\)

b) 100 : \(\left\{230:\left[450-\left(4-5^3-5^2.25\right)\right]\right\}\)

c) 30 . \(\left\{175:\left[355-\left(135+37.5\right)\right]\right\}\)

Answer 1

a) 24.5 - [ 131. ( 13 - 4 )² ]

=120 - [ 131 . 9² ]

=120 - [ 131 . 81 ]

=120 - 10611

= - 10491

Answer 2

b) 100 : {230:[450−(4−5³−5².25)]}

= 100 : \(\left\{230:\left[450-\left(4-125-25.25\right)\right]\right\}\)

= \(100:\left\{230:\left[450-\left(4-125-625\right)\right]\right\}\)

= \(100:\left\{230:\left[450-\left(-746\right)\right]\right\}\)

=\(100:\left\{230:1196\right\}\)

= 100 : \(\dfrac{5}{26}\)= 520

Answer 3

c) 30 . {175:[355−(135+37.5)]}

= 30. \(\left\{175:\left[355-\left(135+185\right)\right]\right\}\)

= 30 . \(\left\{175:\left[355-320\right]\right\}\)

= 30 . \(\left\{175:35\right\}\)

= 30 .5 = 150