Question

A星号B=AB分之2A-3B,求（-2）星号【4星号（-3分之1）】的值

Answer 1

a星号b = (2a - 3b)/(ab),求(-2)星号[4星号(-1/3)]的值.(-2)星号[4星号(-1/3)] = (-2)星号[(2×4 + 1)/[4×(-1/3)] = (-2)星号(-27/4) = [2×(-2) - 3×(-27/4)]/[(-2)×(-27/4)] = 65/54