初二数学 解方程
(x+2)/(x+1)+(x+5)/(x+4)=(x+4)/(x+3)+(x+3)/(x+2)...
(x+2)/(x+1)+(x+5)/(x+4)=(x+4)/(x+3)+(x+3)/(x+2)
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(x+2)/(x+1)+(x+5)/(x+4)=(x+4)/(x+3)+(x+3)/(x+2)
(x+5)/(x+4)-(x+4)/(x+3)=(x+3)/(x+2)-(x+2)/(x+1)
-1/(X+4)(X+3)=-1/(X+2)(X+1)
(X+3)(X+4)=(X+2)(X+1)
X2+7X+12=X2+3X+2
4X=-10
X=-2.5
(x+5)/(x+4)-(x+4)/(x+3)=(x+3)/(x+2)-(x+2)/(x+1)
-1/(X+4)(X+3)=-1/(X+2)(X+1)
(X+3)(X+4)=(X+2)(X+1)
X2+7X+12=X2+3X+2
4X=-10
X=-2.5
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(x+2)/(x+1)+(x+5)/(x+4)=(x+4)/(x+3)+(x+3)/(x+2)
1+1/(x+1)+1+1/(x+4)=1+1/(x+3)+1/(x+2)
1/(x+1)+1/(x+4)=1/(x+3)+1/(x+2)
1/(x+1)-1/(x+2)=1/(x+3)-1/(x+4)
1/[(x+1)(x+2)]=1/[(x+3)(x+4)]
x^2+7x+12=x^2+3x+2
得 4x=-10
x=-5/2
1+1/(x+1)+1+1/(x+4)=1+1/(x+3)+1/(x+2)
1/(x+1)+1/(x+4)=1/(x+3)+1/(x+2)
1/(x+1)-1/(x+2)=1/(x+3)-1/(x+4)
1/[(x+1)(x+2)]=1/[(x+3)(x+4)]
x^2+7x+12=x^2+3x+2
得 4x=-10
x=-5/2
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2012-04-14
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x=-2.5
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