1*5/1+5*9/1+9*13/1+13*17/1+.45*49/1
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1*5/1+5*9/1+9*13/1+13*17/1+.45*49/1
1*5/1+5*9/1+9*13/1+13*17/1+.45*49/1
1*5/1+5*9/1+9*13/1+13*17/1+.45*49/1
上面是分子吧,应该是这样写:
1/1*5+1/5*9+...+1/45*49
=1/4[1-1/5]+1/4[1/5-1/9]+...+1/4[1/45-1/49]
=1/4[1-1/5+1/5-1/9+...+1/45-1/49]
=1/4*[1-1/49]
=1/4*48/49
=12/49
1/[n*(n+4)]=[1/n-1/(n+4)]/4
原式=[(1-1/5)+(1/5-1/9)+……+(1/45-1/49)]/4
=(1-1/49)/4
=12/49
1/5*1/9+1/9*1/13+1/13*1/17+.1/101*1/105
1*5/1+5*9/1+9*13/1+13*17/1+17*21/1
1/1*5+1/5*9+1/9*13+1/13*17+1/17*21
1*5/1+5*9/1+9*13/1+13*17/1+.45*49/1
1/1×5+1/5×9+1/9×13+1/13×17+...+1/25×29=
1/5*9+1/9*13+.+1/101*105
1*1/5+1/5*1/9 1*1/5+1/5*1/9+1/9*1/13+1/13*1/17 计算
计算1/1*5+1/5*9+1/9*3+.+1/81*85计算1/1*5+1/5*9+1/9*13+......+1/81*85
1/7*5+1/7*9+1/9*11+1/11*13+1/13*15
计算:1/3*5+1/5*7+1/7*9+1/9*11+1/11*13
数学题1*5/1+5*9/1+9*13/1 .+33*37/1=?
1/1*5+1/5*9+1/9*13+.+1/101*105
1/1×5+1/5×9+1/9×13+...+1/2009×2013
1×5/1+5×9/1+9×13/1+…+2009×2013/1
1/1*5+1/5*9+1/9*13+.+1/55*59
1/1*5+1/5*9+1/9*13+.+1/55*59
1/1*5+1/5*9+1/9*13+.+1/33*37
1/1×5+1/5×9+1/9×13……+1/33×37 简便计算