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3 Calculati:
a) 10⁶⁰÷(2×5)⁵⁸;
b) (7¹⁴×5)²÷7²⁶;
c) 5×230–7×(512÷32+2²)+4687÷43
d) [493÷17–(128÷2³+224÷8)÷22]÷27 –1.​