1/(X-1)(x-2)=1/（x-2）-1/(x-1)所以1/(4-x)+1/(X-1)(x-2)+1/(x-2)(x-3)+1/(X-3)(x-4)=1/4-x+1/（x-2）-1/(x-1)+1/(x-3)-1/(x-2)+1/(x-4)-1/(x-3)=-1/(x-1)
1/4-x+1/(X-1)(x-2)+1/(x-2)(x-3)+1/(X-3)(x-4)
=-1/(x-4)+1/(x-2)-1/(x-1)+1/(x-3)-1/(x-2)+1/(x-4)-1/(x-3)
=-1/(x-1)
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