(a+b)2-(a-b)2=a2+2ab+b2-(a2-2ab+b2)=a2+2ab+b2-a2+2ab-b2=4ab
E=24001^2-23999^2=(24000+1)2-(24000-1)2
E=4ab donc E=4x24000x1=96000
Produit ab=10 donc E=4x10=40
Si ab=7 E=7x4=28
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(a+b)2-(a-b)2=a2+2ab+b2-(a2-2ab+b2)=a2+2ab+b2-a2+2ab-b2=4ab
E=24001^2-23999^2=(24000+1)2-(24000-1)2
E=4ab donc E=4x24000x1=96000
Produit ab=10 donc E=4x10=40
Si ab=7 E=7x4=28