X=5
所有的式子都化成 1/(X+2)(x+4)={1/(X+2)-1/(X+4)}/2
原等式等于10/X(X+10)=2/3X
X的平方=5X
X不等于0,所以X=5
1/x(X+2)+1/(X+2)(x+4)+.1/(x+8)(x+10)=1/3x
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