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[4-(11-23)(28-30)-3(7-11)]-[2-(7+4)]} ma puteti ajuta ?

Răspuns :

{[4-(11-23)(28-30)-3(7-11)]-[2-(7+4)]} =
=[4-(-12)(-2)-3(-4)]-(2-11) =
=[4-(+24)+12]+9 =
=4-24+12+9 =
=-20+21 =1