1949x(1/51-1/2000)+51x(1/1949-1/2000)-2000X(1/1949+1/51)+3
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1949x(1/51-1/2000)+51x(1/1949-1/2000)-2000X(1/1949+1/51)+3
1949x(1/51-1/2000)+51x(1/1949-1/2000)-2000X(1/1949+1/51)+3
1949x(1/51-1/2000)+51x(1/1949-1/2000)-2000X(1/1949+1/51)+3
1949x(1/51-1/2000)+51x(1/1949-1/2000)-2000X(1/1949+1/51)+3 =1949/51-1949/2000+51/1949-51/2000-2000/1949-2000/51+3 =(1949/51-2000/51)+(51/1949-2000/1949)+(-1949/2000-51/2000)+3 =(-3)+3 =0 根据分母调整一下各项的顺序合并就可以了.
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