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1/ab+1/(a+2)(b+2)+1/(a+4)(b+4)+……+1/(a+100)(b+100)=1/1×3+1/3×5+1/5×7+……+1/101×103=1/2(1-1/3+1/3-1/5+1/5-1/7+……+1/101-1/103)=1/2(1-1/103)=1/2×102/103=51/1031/2是哪来的

题目详情
1/ab+1/(a+2)(b+2)+1/(a+4)(b+4)+……+1/(a+100)(b+100)
=1/1×3+1/3×5+1/5×7+……+1/101×103
=1/2(1-1/3+1/3-1/5+1/5-1/7+……+1/101-1/103)
=1/2(1-1/103)
=1/2×102/103
=51/103
1/2是哪来的
▼优质解答
答案和解析
1/1×3=1/2×(1-1/3)
1/3×5=1/2×(1/3-1/5)
1/5×7=1/2×(1/5-1/7)
…………………………
1/101×103=1/2×(1/101-1/103)
必须保证分数值相等
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