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Sagot :

Bonjour,

4/3 -( 4/8 +7/8)

= 4/3 - 11/8

=32/24 - 33/24

= -1/34

20/15 -21/15  - ( 21/35 - 25/35)

=  -1/15 - (4/35)

= -1/15 - 4/35

= -1/15 * 35/35  - 4/35 * 15/15

= -35/ 525 - 60/525

= -95/525 = -19/105

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