1.若2x^5a y^b+4與-1/2x^1-2b y^2a的和仍為一個單項式,則b^a=_______.

1.若2x^5a y^b+4與-1/2x^1-2b y^2a的和仍為一個單項式,則b^a=_______.

由題意得
5a=1-2b
b+4=2a
解得a=1
b=-2

b的a次方=-2