(x+1分之x+1)除以(1- 1-x²分之3x平方)乘以x-1分之1,其中x=4分之根号6.求值
问题描述:
(x+1分之x+1)除以(1- 1-x²分之3x平方)乘以x-1分之1,其中x=4分之根号6.求值
答
(x+1分之x+1)除以(1- 1-x²分之3x平方)乘以x-1分之1=[x/(x+1)+1]÷[1+3x²/(x²-1)]*1/(x-1)=(x+x+1)/(x+1)÷(x²-1+3x²)/(x-1)(x+1)*1/(x-1)=(2x+1)*(x-1)/(x²+3x²-1)*1/(x-1)=...