问题描述:
1/1×3+1/3×5+1/5×7+1/7×9+……+1/49×51
还有
1/1×2×3+1/2×3×4+1/3×4×5+1/4×5×6+……1/48×49×50
都用简便计算
还有
1/1×2×3+1/2×3×4+1/3×4×5+1/4×5×6+……1/48×49×50
都用简便计算
问题解答:
我来补答展开全文阅读