Bonjour,
a)
b)
car
Bonjour
on te dit que
17 x 13 = 221 et que 17 x 15 = 255
donc le facteur commun est 17
on simplifie la fraction par 17
255/221 = 15/13
17/19 = 221/247
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Bonjour,
a)![\frac{255}{221} = \frac{17*15}{17*13} = \frac{15}{13} \frac{255}{221} = \frac{17*15}{17*13} = \frac{15}{13}](https://tex.z-dn.net/?f=%5Cfrac%7B255%7D%7B221%7D%20%3D%20%5Cfrac%7B17%2A15%7D%7B17%2A13%7D%20%3D%20%5Cfrac%7B15%7D%7B13%7D)
b)![\frac{17}{19} = \frac{221}{247} \frac{17}{19} = \frac{221}{247}](https://tex.z-dn.net/?f=%5Cfrac%7B17%7D%7B19%7D%20%3D%20%5Cfrac%7B221%7D%7B247%7D)
car![\frac{221}{247} = \frac{17*13}{13*19} = \frac{17}{19} \frac{221}{247} = \frac{17*13}{13*19} = \frac{17}{19}](https://tex.z-dn.net/?f=%5Cfrac%7B221%7D%7B247%7D%20%3D%20%5Cfrac%7B17%2A13%7D%7B13%2A19%7D%20%3D%20%5Cfrac%7B17%7D%7B19%7D)
Bonjour
on te dit que
17 x 13 = 221 et que 17 x 15 = 255
donc le facteur commun est 17
on simplifie la fraction par 17
255/221 = 15/13
17/19 = 221/247