1解:已知x+y=3,x-y=2;∴x=5/2,y=1/2;∴2x³y-2xy³=2xy(x+y)(x-y)=2×5/2×1/2(5/2+1/2)(5/2-1/2)=15;2解:已知xⁿ-yⁿ=(x²+y²)(x+y)(x-y)∴xⁿ-yⁿ=x⁴-y⁴∴n=4;