把每一个拆开,例如1/2*3可改写成1/2-1/3,正好和第二项1/3-1/4抵消一个1/3,依此类推下去,最后可简化成1/2-1/50,结果为12/25,谢谢
1/2×3+1/3×4+1/4×5+……+1/49×50
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1×2/1+1×2×3/2+1×2×3×4/3+1×2×3×4×5/4+1×2×3×4×5×6/5等于多少啊