Sans calculatrice, calculer astucieusement 10005 au carrée - 9995 au carrée =
(10000+5)²-(10000-5)²= 10 000²+ 10*10 000 +25 - (10 000² -10*10000+25)=
200 000 = 2 * 10^5
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Sans calculatrice, calculer astucieusement 10005 au carrée - 9995 au carrée =
(10000+5)²-(10000-5)²= 10 000²+ 10*10 000 +25 - (10 000² -10*10000+25)=
200 000 = 2 * 10^5