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Sagot :

Bonjour,

a. 5/x - 4/5

25x/ 5x  - 4x/5x =  21x/ 5x = 21/5

b. 4 + 1/x+2

4x/x +1/x +2x/x=  7x/x = 7

c. 3/x - 2/x+1

=1/x  +  1

=1/x + x/x

= (1+x)/x

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