Question

求3(a-2b)^2n-(2b-a)^2n-1+5-5(2b-a)^2n+2(a-2b)^2n-1-4的值,其中a-2b

Answer 1

a-2b=-1

原式=3(a-2b)^2n+(a-2b)^(2n-1)-5(a-2b)^2n+2(a-2b)^(2n-1)+1

=-2(a-2b)^2n+3(a-2b)^(2n-1)+1

=-2×1+3×(-1)+1

=-4