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Ty17893
@Ty17893
May 2019
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Bonjour, j'aurais besoin d'aide pour demain svp
Effectue les calculs suivants sans calculatrice en justifiant
1) 11 234 567 895 x 1 234 567 892 - 1 234 567 890 x 1 234 567 896
2) 2019 x 2017 - 2018²
Merci
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cossin23
Verified answer
Bonsoir
2)(2018+1)(2018-1) -2018^2
=2018^2-1-2018^2
=-1
1)je pense ex n est pas bien écrit
(1234567893+2)×(1234567893-1)-(1234567893-3)(1234567893+3)=
1234567893^2-1234567893+2×1234567893-2
-1234567893^2+9=
1234567893+7=
1234567900
.
..
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Verified answer
Bonsoir2)(2018+1)(2018-1) -2018^2
=2018^2-1-2018^2
=-1
1)je pense ex n est pas bien écrit
(1234567893+2)×(1234567893-1)-(1234567893-3)(1234567893+3)=
1234567893^2-1234567893+2×1234567893-2
-1234567893^2+9=
1234567893+7=
1234567900
.
..