1/3*4+1/4*5+1/5*6+······+1/19*20简便方法计算
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![1/3*4+1/4*5+1/5*6+······+1/19*20简便方法计算](/uploads/image/z/128382-6-2.jpg?t=1%2F3%2A4%2B1%2F4%2A5%2B1%2F5%2A6%2B%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%2B1%2F19%2A20%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97)
1/3*4+1/4*5+1/5*6+······+1/19*20简便方法计算
1/3*4+1/4*5+1/5*6+······+1/19*20简便方法计算
1/3*4+1/4*5+1/5*6+······+1/19*20简便方法计算
1/3*4+1/4*5+1/5*6+······+1/19*20
=1/3-1/4+1/4-1/5+1/5-1/6+...+1/19-1/20
=1/3-1/20
=17/60
证明1·3·5·····(2n-1)/2·4·6·····2n
序列 1 2 3 4 5 6 ······ n 对应的数 1 3 6 10 21······?
计算1-2+3-4+5-6+······+99-100=
计算:(2+4+6+8+···+100)-(1+3+5+···+99)
1+2+3+4+5+6······38+39=?
计算1-2+3-4+5-6+······-98+99=
1+2+3+4+5+6· · · · · ·+2013等于多少
1*2*3*4*5*6*······*n的规律
计算 1-2+3-4+5-6+····+(-1)^n+1*n
1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········?
把1 9填入81格方框,不能重复· · 4 · · 5 · 6 ·9 · · 3 · · · 5 17 · · 6 · · · · 3· · 9 · 1 6 · 4 ·· 2 · 4 · · · 8 ·· 4 · 7 · · 5 · ·5 · · · · 7 · · 84 1 · · · 8 · · 5· 8 · 9 · · 6 · 4
计算:|1/4-1/3|+|1/5-1/4|+|1/6-1/5|+······+|1/20-1/19|
计算:1-2+3-4+5-6+·····+2007-2008的结果
1+2+3+4+5····+50
(2+4+6+8+······+100)—(1+3+5+7+······+99)等于几
(1+3+5++7+9······+2011)-(2+4+6+8······+2012)=
(1+3+5+······2013)—(2+4+6······+2014)用简便方法哦,这是奥数题.
1×2+2×3+3×4+4×5+5×6+6×7+7×8+8×9··········+100×101等于多少?1×2+2×3+3×4+4×5+5×6+6×7+7×8+8×9··········+n(n+1)这个要代数式.