Pouvez vous m'aidez svp: Développer et réduire les expressions suivantes :

3a(4+5a)+a(2-a)=

3(5-2a)+a(a-1)=

2a(1-a)+a(2a-4)=

3(a2-2a+6)+2(2a2+4a-3)=

3[4+5a(2+a)]=

-2a+a[a+3(a-1)]=
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