Question

DAU COROANA! AJUTOR!!!!!!

Answer 1

1)

( 17 / 24 + 5 / 36 ) - ( 5 / 60 - 1 / 18 ) =

( 51 / 72 + 10 / 72 ) - ( 15 / 180 - 10 / 180 ) =

61 / 72 - 5 / 180 =

305 / 360 - 10 / 360 =

295 / 360 = 59 / 72

2)

( 7 / 9 + 17 / 10 - 1 / 18 ) - ( 13 / 27 - 1 / 18 ) =

( 70 / 90 + 153 / 90 - 5 / 90 ) - ( 26 / 54 - 3 / 54 ) =

( 223 / 90 - 5 / 90 ) - 23 / 54 =

218 / 90 - 23 / 54 =

654 / 270 - 115 / 270 = 539 / 270

3)

( 7 / 16 + 17 / 5 - 1 / 40 ) - ( 5 / 8 - 3 / 5 ) =

( 35 / 80 + 272 / 80 - 2 / 80 ) - ( 25 / 40 - 24 / 40 ) =

( 307 / 80 - 2 / 80 ) - 1 / 40 =

305 / 80 - 1 / 40 =

305 / 80 - 2 / 80 = 303 / 80