дәм СТО
(-1 7/8•1 4/5+9/10)•(-8/9)-2 1/2
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0

Пошаговое объяснение:

(-1 7/8 * 1 4/5 + 9/16) * (-8/9)-2 1/2 = (-15/8 * 9/5 + 9/16) * (-8/9)-2 1/2 = (-27/8 + 9/16) * (-8/9)-2 1/2 = (9/16 - 27/8) * (-8/9)-2 1/2 = (9 * 1 - 27 * 2)/16 * (-8/9)-2 1/2 = (9 - 54)/16 * (-8/9) -2 1/2= -45/16 * (-8/9)-2 1/2 = -5/2-2 1/2 = - 2 1/2-2 1/2=0