1.(x'2+1/x+1)+[3(x+1)/(x'2+1)]=42.2x'2-4x-3/(x'2-2
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解决时间 2021-02-05 07:35
- 提问者网友:書生途
- 2021-02-04 18:06
1.(x'2+1/x+1)+[3(x+1)/(x'2+1)]=42.2x'2-4x-3/(x'2-2
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- 五星知识达人网友:杯酒困英雄
- 2021-02-04 18:12
1.[(x^2+1)/(x+1)]+[3(x+1)/(x^2+1)]=4t=(x^2+1)/(x+1)t+3/t=4t^2-4t+3=0t=1或t=3(x^2+1)/(x+1)=1,x^2=x,x=1或x=0(x^2+1)/(x+1)=3 x2-3x=2 x=±√13/2+3/22.(2x^2-4x-3)/(x^2-2x-1)=32-1/(x^2-2x-1)=3x^2-2x-3=-1(x-1)^2=3,x=±√3+13.2(x^2+1/x^2)-3(x+1/x)=1t=x+1/x ,x^2+1/x^2=t^2-22t^2-4-3t=12t^2-3t-5=0(2t-5)(t+1)=0,t=5/2或t=-1x+1/x=5/2,2x^2-5x+2=0,(2x-1)(x-2)=0,x=2或x=1/2x+1/x=-1,x^2+x+1=0,无实数解4.当m为何值时,关于x的方程m/(x^2-x-2)=x/(x+1)-(x-1)/(x-2) 的解是正数?m/(x^-x-2)=x/(x+1)-(x-1)/(x-2)m=x^2-2x-x^2+1m=1-2xx=(1-m)/2x>0m
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- 1楼网友:零点过十分
- 2021-02-04 19:09
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