1949×(1/51-1/2000)+51×(1949-1/2000)-2000×(1/1949+1/51)+3
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![1949×(1/51-1/2000)+51×(1949-1/2000)-2000×(1/1949+1/51)+3](/uploads/image/z/187992-0-2.jpg?t=1949%C3%97%EF%BC%881%EF%BC%8F51%EF%BC%8D1%EF%BC%8F2000%EF%BC%89%2B51%C3%97%EF%BC%881949%EF%BC%8D1%EF%BC%8F2000%EF%BC%89%EF%BC%8D2000%C3%97%EF%BC%881%EF%BC%8F1949%EF%BC%8B1%EF%BC%8F51%EF%BC%89%EF%BC%8B3)
1949×(1/51-1/2000)+51×(1949-1/2000)-2000×(1/1949+1/51)+3
1949×(1/51-1/2000)+51×(1949-1/2000)-2000×(1/1949+1/51)+3
1949×(1/51-1/2000)+51×(1949-1/2000)-2000×(1/1949+1/51)+3
1949*(1/51-1/2000)+51*(1/1949-1/2000)-2000*(1/1949+1/51)+3
=1949/51-1949/2000+51/1949-51/2000-2000/1949-2000/51
=(1949/51-2000/51)+(51/1949-2000/1949)-(1919/2000+51/1949)+3
=-51/51-1949/1949-2000/2000+3
=-1-1-1+3
=0
原式=1949/51-1949/2000+51/1949-51/2000-2000/1949-2000/51+3
=3-(2000-1949)/51-(1949+51)/2000-(2000-1949)/1949
=3-1-1-1
=0