Question

Thựic hiện các phép tính sau :

a) 19 + 19 . 99 - 25 . 4

b) 2 . [( 7 - 3³ : 3² ) : 2² + 99 ] - 100

c) | -5 + 9 | + ( -29 + 5 )

 

Answer 1

a) 19 + 19 . 99 - 25 . 4

= 19 . 100 - 25 . 4

= 1900 - 100

= 1800

b) 2 . [(7 - 3³ : 3²) : 2² + 99] - 100

= 2 . [(7 - 3) : 4 + 99] - 100

= 2 . [4 : 4 + 99] - 100

= 2 . [1 + 99] - 100

= 2 . 100  - 100

= 200 - 100

= 100

c) | -5 + 9 | + ( -29 + 5 )

= 4 + (-24)

= -20

Answer 2

a)19+19.99-25.4

=19.999+1)-100

=19.100-100

=100.(19-1)

=100.18

=1800

b)2.[(7-3^3:3^2):2^2+99]-100

=2.[(7-3):4+99]-100

=2.[4:4+99]-100

=2.[1+99]-100

=2.100-100

=200-100

=100

c)|-5+9|+(-29+5)

=|4|+(-24)

=4+(-24)

=-20

Answer 3

a,

=19+1881-100

=1900-100

=1800.

b,

=2.[(7-27:9):4+99]-100

=2.[(7-3):4+99]-100

=2.[4:4+99]-100

=2.[1+99]-100

=2.100-100

=200-100

=100

c,

=|4|+(-24)

=4+(-24)

=-20.