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Andrew1011
@Andrew1011
May 2019
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Bonsoir,je suis en 3 ème et j'ai besoin d'aide c'est pour demain.
Calculer en utilisant une égalité remarquables:
98*102=
205²=
53²-47²=
Merci beaucoup d'avance
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Geijutsu
Verified answer
Bonsoir,
98*102 = (100-2)(100+2) = 100²-2² = 10000-4 =
9996
205² = (200+5)² = 200²+2*200*5+5² = 40000+2000+25 =
42025
53²-47² = (53-47)(53+47) = 6*100 =
600
2 votes
Thanks 1
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Verified answer
Bonsoir,98*102 = (100-2)(100+2) = 100²-2² = 10000-4 = 9996
205² = (200+5)² = 200²+2*200*5+5² = 40000+2000+25 = 42025
53²-47² = (53-47)(53+47) = 6*100 = 600