réduire ces calculs suivant, en détaillant les calculs.

2a+(-8)+9-a²=

10a-7a²-11a-13a²=

7a+6-21a+7=

28a-27a-1+7a=

-9a-6+4a-(-7)=

-3a²+8a²-2a²-5-2a=

-2a+12+7a-2a²+1=

7a²-4-2a²+4a-6=


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