Объяснение:
1) ba * 8ac = 8 * a*a*b*c = 8a²bc
8a²bc = 8 *(½ )² * (-3) * 2 = 8 * ¼*(-6) = 2 * (-6) = -12
2) (⅘ *8* 5/16 ) * x * x² * y²*y = 2x³y³
2x³y³ = 2 * 3³ *(⅑)³ = 2 * 3³ * [(⅓ )²]³ = 2 * 3³/3⁶ = 2/3³ = 2/27
