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6 Calculați:
A. 46:23+ {78-3 [(15+7×5): 51-3×7};
B. 9×{8+7 [6+5×(4+3×(2+1))]}:(1+2+3+... + 9);
C. 1+2×<3+4:{5-6:[7-8:(9 – 1)]}>.​