数学题啊啊。

显示全部楼层 · 2013-3-18 19:03:05

解原式=（x-4）/（x+1)(x-1)÷（x-4)(x+1)/(x+1)2+1/（x-1）=（x-4）/（x+1)(x-1)×(x+1)2/（x-4)(x+1)+1/（x-1）=1/（x-1）+1/（x-1）=2/（x-1）由x=2√3+1即原式=2/（2√3+1-1）=2/2√3=√3/3...

千问 · 2013-3-18 19:03:05

(X-4)/(X+1)(X-1)乘（X+1）^2/(X-4)(X+1)+1/X-1=(X+1)/(X+1) +1/X-1=X/X-1把X=2√3+1代入2√3+1除2√3+1-1=6+√3除6希望给满意解原式=（x-4）/（x+1)(x-1)÷（x-4)(x+1)/(x+1)2+1/（x-1）=（...

千问 · 2013-3-18 19:03:05

(X-4)/(X+1)(X-1)乘（X+1）^2/(X-4)(X+1)+1/X-1=(X+1)/(X+1) +1/X-1=X/X-1把X=2√3+1代入2√3+1除2√3+1-1=6+√3除6希望给满意...

千问 · 2013-3-18 19:03:05

如果你平方和，平方差，十字相乘法比较熟悉这条题口算就能做出来……...