(1/x+1)+(1/x+10)=(1/x+2)+(1/x+9)
问题描述:
(1/x+1)+(1/x+10)=(1/x+2)+(1/x+9)
答
1/(x+1)+1/(x+10)=1/(x+2)+1/(x+9),1/(x+1)-1/(x+2)=1/(x+9)-1/(x+10)[(x+2)-(x+1)]/(x+!)(x+2)=[(x+10)-(x+9)]/(x+9)(x+10)1/(x+1)(x+2)=1/(x+9)(x+10),(x+1)(x+2)=(x+9)(x+10)x^2+3x+2=x^2+19x+90,16x=-...