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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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