(x+1分之1+x的2次方-1分之x的2次方-2x+1)除以x+1分之x-1,其中x等于2

2024-12-30 07:04:36
推荐回答(2个)
回答1:

[1/(x+1)+(x^2-2x+1)/(x^2-1)]*(x+1)/(x-1),其中x等于2
=[1/(x+1)+(x-1)^2/(x-1)(x+1)]*(x+1)/(x-1),
=[1/(x+1)+(x-1)/(x+1)]*(x+1)/(x-1),
=[x/(x+1)]*(x+1)/(x-1),
=x/(x-1),
原式=x/(x-1)=2/(2-1)=2

回答2:

[1/(x+1)+(x²-2x+1)/(x²-1)]÷(x-1)/(x+1)
=[1/(x+1)+(x-1)²/(x-1)(x+1)]÷(x-1)/(x+1)
=[1/(x+1)+(x-1)/(x+1)]÷(x-1)/(x+1)
=[(1+x-1)/(x+1)]÷(x-1)/(x+1)
=[x/(x+1)]÷(x-1)/(x+1)
=x/(x+1)*(x+1)/(x-1)
=x/(x-1)