1. If the sum of 2x ^ 5A y ^ B + 4 and - 1 / 2x ^ 1-2b y ^ 2a is still a monomial, then B ^ A=_______ .

1. If the sum of 2x ^ 5A y ^ B + 4 and - 1 / 2x ^ 1-2b y ^ 2a is still a monomial, then B ^ A=_______ .

From the meaning of the title
5a=1-2b
b+4=2a
The solution is a = 1
b=-2

The a power of B = - 2