(x-3)/2+(2x-4)/3+(3x-5)/4+……+(8x-10)/9=(3x-1)/2+(4x-2)/3+……+(10x-8)/9 x=
问题描述:
(x-3)/2+(2x-4)/3+(3x-5)/4+……+(8x-10)/9=(3x-1)/2+(4x-2)/3+……+(10x-8)/9 x=
答
(-2x-2)/2+(-2x-2)/3+(-2x-2)/4+…+(-2x-2)/9=0 (-2x-2)*(1/2+1/3+1/4+1/5+…+1/9)=0 -2x-2=0 -...