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800;[674+26-600]=?

[757-399+642];10;100=?
100x[1000-993];10=?
[2756-1756];100x10=?

Răspuns :

Laucretu
800 : (674 + 26 - 600) =
= 800 :  100 =
= 8

(757 - 399 + 642) : 10 : 100 =
= 1000 : 10 : 100 =
= 100 : 100 =
= 1

100 x (1000-993) : 10 =
= 100 x 7 : 10 =
= 700 : 10 =
= 70

(2756 - 1756) : 100 x 10 =
= 1000 : 100 x 10 =
= 100

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