Question

12:{390:[500-(125 + 35 x 7 )]}

Answer 1

Ta có A = 12 : { 390 : [ 500 - 370 ]}

= 12 : { 390 : 130 }

= 12 : 3

= 4

Answer 2

12:(390:(500-(125+245)))

=12:(390:(500-370))

=12:(390:130)

=12:3

=4

Answer 3

12 : { 390 : [ 500 - ( 125 + 35 x 7 ) ] }

= 12 : { 390 : [ 500 - ( 125 + 245 ) ] }

= 12 : { 390 : [ 500 - 370 ) ] }

= 12 : { 390 : 130 }

= 12 : 3

= 4

Hok tốt