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Efectuati: a) 12^34:12^32 -3^1x3^2+2^3
B) 2^3x3^2+25^0x11^2-4^0
C) 1+{2+[3x(4+5)-6+7x8]-9}
D) 9x{[8+7x(6+5)]x4-3}+2