👤

Sagot :

Bonsoir,

13/60 + 52/55
On cherche un dénominateur commun : 60 x 11 = 55 x 12 = 660

= (13 x 11)/(60 x 11) + (52 x 12)/(55 x 12)

= 143/660 + 624/660

= (143 + 624)/660

= 767/660

19/20 - 5/44
Un dénominateur commun est 220 car 20 x 11 = 44 x 5 = 220

= (19 x 11)/(20 x 11) - (5 x 5)/(44 x 5)

= 209/220 - 25/220

= 184/220

On peut simplifier :

= (46 x 4)/(55 x 4)

= 46/55

15/17 - 13/16

= (15 x 16)/(17 x 16) - (13 x 17)/(16 x 17)

= 240/272 - 221/272

= 19/272

1) = 767/660 soit = environ 1.16
2) =46/55 soit = environ 0.83
3)= 19/272 soit= environ 0.06

© 2024 IDNLearn. All rights reserved.