解方程:(x²+4x+3)分之x -(x+3)分之2=1
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解方程:(x²+4x+3)分之x -(x+3)分之2=1
解方程:(x²+4x+3)分之x -(x+3)分之2=1
解方程:(x²+4x+3)分之x -(x+3)分之2=1
(x²+4x+3)分之x -(x+3)分之2=1
x/[(x+1)(x+3)]-2/(x+3)=1
x-2(x+1)=(x+1)(x+3)
x-2x-2=x²+4x+3
x²+4x+3-x+2x+2=0
x²+5x+5=0
x²+5x+(5/2)²=25/4-5
(x+5/2)²=5/4
x+5/2=±√5/2
x=5/2±√5/2
x /(x²+4x+3) - 2 /(x+3)=1
x / [(x+3)(x+1)] - 2 / (x+3) =1
[ x-2(x+1)] / [(x+3)(x+1)] =1
(x-2x-1) =(x+3)(x+1)
...
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x /(x²+4x+3) - 2 /(x+3)=1
x / [(x+3)(x+1)] - 2 / (x+3) =1
[ x-2(x+1)] / [(x+3)(x+1)] =1
(x-2x-1) =(x+3)(x+1)
(-x-1) = (x+3)(x+1)
-(x+1) = (x+3)(x+1)
-1 =x+3
x =-4
令x+1=0
x =-1
x=-1 or x=-4
收起
x/(x^2+4x+3) - 2/(x+3) =1
x/[(x+3)(x+1)] - 2/(x+3) =1
x-2(x+1) = (x+3)(x+1)
-x-1=x^2+4x+3
x^2+5x+4=0
(x+1)(x+4) =0
x=-4 or -1(rej)
ie x=-4
解方程:
(x²+4x+3)分之x -(x+3)分之2=1
x/[(x+3)(x+1)-2(x+1)/[(x+3)(x+1)=1
x-2x-2=(x+3)(x+1)
x^2+5x+5=0
(x+2.5)^2=1.25
x+2.5=土√1.25
x1=-2.5+√1.25 x2=-2.5-√1.25
赞同tllau38|十四级 正x=-4。如x=-1,分母就为0了,不成立。
x²+4x+3≠0, x+3≠0
x≠-1或-3
x/(x²+4x+3) - 2/(x+3) =1
[x- 2(x+1)]/(x²+4x+3)=1
-x-2=x²+4x+3
x²+5x+5=0
x=(-5±√5) /2