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Sagot :

Bonjour,

A = -1/15 + 3/20

= -1×20/15×20 + 3×15/20×15

= -20/300 + 45/300

= 25/300

= 1/12

B = -11/20 + 7/12

= -11×7/20×7 + 7×20/7×20

= -77/140 + 140/140

= 63/140

= 9/20

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