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81⁴:27³-7*[278*-(173*17-15*173)-345*(139*41-139*39)]

Răspuns :

3¹⁶:3⁹-7*[278*173(17-15)-345*139(41-39)]
3⁷-7*(278*173*2-345*139*2)=3⁷-7*(96188-95910)
3⁷-7*278=2187-1946=241