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Ответ:

Пошаговое объяснение:

[tex]-3(\frac{2}{3} c-1\frac{1}{6} d)+8(2.5d-5\frac{1}{4} c)=-3(\frac{2}{3} c-\frac{7}{6} d)+8(2.5d-\frac{21}{4} c)=-2c+\frac{7}{2} d+20d-42c=-44c+23.5d[/tex]

[tex]-44*0.5+23* (-2)=-22 - 46 = -68[/tex]