aider moi svp ......​

Bjr

= 1/91 + -3/91

= 1-3/91

= -2/91

= - 2/91

= 21/55+-17/55

= 21-17/55

= 4/55

= 1/-19+7/-19

= - 1/19- 7/19

= -1-7/19

= -8/19

= - 8/19

= -4/-25+-2/-25

= 4/25+2/25

= 4+2/25

= 6/25

= -25/-31+2/-31

= 25/31+2/31

= 25+2/31

= 27/31

= -7/-61+82/-61

= 7/61+82/61

= 7+82/61

= 89/61

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