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Sagot :

Bonsoir,

1/5+1=?

On met au même dénominateur

1/5 + 1* 5/5

= 1/5 +5/5

= 6/5

1+1/3+1/9=

1* 9/9 +1/3 * 3/3+ 1/9

= 9/9 + 3/9 +1/9

= 13/9

2-3/7

2* 7/7 -3/7

= 14/7 - 3/7

= 11/7

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