(13/2x-1.5)^2-(13/2x+3/2)^2=-39
问题描述:
(13/2x-1.5)^2-(13/2x+3/2)^2=-39
答
(13/2x-1.5)^2-(13/2x+3/2)^2=-39
(13/2x-1.5-13/2x-1.5)(13/2x-1.5+13/2x+1.5)=-39
-3*13x=-39
x=1