1+2×3/1+3×4/1...202×203/1=多少?
2个回答
1/2×3=1/2-1/3=1/6
1/3×4=1/3-1/4=1/12
所以.原式=1+1/2-1/3+1/3-1/4+...1/202-1/203=1+1/2-1/203=607/406
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