Question

Thực hiện phép tính :  5 [ ( 85 - 35: 7 ) : 80 + 90 ] - 50 

Answer 1

5 . [(85 - 35 : 7) : 80 + 90] - 50
= 5 . [(85 - 5) : 80 + 90] - 50
= 5 . [80 : 80 +90] - 50
= 5 . [1 + 90] - 50
= 5 . 91 - 50
= 455 - 50 = 405

Answer 2

5 [ ( 85 - 35 : 7 ) : 80 + 90 ] - 50

= 5 [ ( 85 - 5 ) : 80 + 90 ] - 50

= 5 [ 80 : 80 + 90 ] - 50

= 5 [ 1 + 90 ] - 50

= 5 . 91 - 50

= 455 - 50

= 405

=))

Answer 3