1/(12×13)+1/(13×14)+……+1/(19×20)的值为?1/(12×13)+1/(13×14)+……+1/(19×20)的值为多少?请列出怎么详解过程.答案是1/40
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![1/(12×13)+1/(13×14)+……+1/(19×20)的值为?1/(12×13)+1/(13×14)+……+1/(19×20)的值为多少?请列出怎么详解过程.答案是1/40](/uploads/image/z/305557-61-7.jpg?t=1%2F%EF%BC%8812%C3%9713%EF%BC%89%2B1%2F%EF%BC%8813%C3%9714%EF%BC%89%2B%E2%80%A6%E2%80%A6%2B1%2F%EF%BC%8819%C3%9720%EF%BC%89%E7%9A%84%E5%80%BC%E4%B8%BA%3F1%2F%EF%BC%8812%C3%9713%EF%BC%89%2B1%2F%EF%BC%8813%C3%9714%EF%BC%89%2B%E2%80%A6%E2%80%A6%2B1%2F%EF%BC%8819%C3%9720%EF%BC%89%E7%9A%84%E5%80%BC%E4%B8%BA%E5%A4%9A%E5%B0%91%3F%E8%AF%B7%E5%88%97%E5%87%BA%E6%80%8E%E4%B9%88%E8%AF%A6%E8%A7%A3%E8%BF%87%E7%A8%8B.%E7%AD%94%E6%A1%88%E6%98%AF1%2F40)
1/(12×13)+1/(13×14)+……+1/(19×20)的值为?1/(12×13)+1/(13×14)+……+1/(19×20)的值为多少?请列出怎么详解过程.答案是1/40
1/(12×13)+1/(13×14)+……+1/(19×20)的值为?
1/(12×13)+1/(13×14)+……+1/(19×20)的值为多少?
请列出怎么详解过程.
答案是1/40
1/(12×13)+1/(13×14)+……+1/(19×20)的值为?1/(12×13)+1/(13×14)+……+1/(19×20)的值为多少?请列出怎么详解过程.答案是1/40
=1/12-1/13+1/13-1/14+...+1/19-1/20
=1/12-1/20
=1/30
1/12-1/13=1/(12X13)下面就会了吧。
1/(12×13×14)+1/(13×14×15)+1/(14×15×16)+1/(15×16×17)
1/(12×13)+1/(13×14)+……+1/(19×20)等于多少
(1/13+1/14)*13*14简算
1/(12+13)+1/(13+14)+.+1/(19+20)=
计算:(-12/13)×[-13/3-(-1/7)×(-13/12)]-7×(+79又13/14)36×(10又1/108)
(10*11)分之1+(11*12)分之1+(12*13)分之1+(13*14)分之1+(14*15)分之1等于多少?
用简便方法计算:|(1/11)-(1/12)|+|(1/12)-(1/13)|+|(1/14)-(1/13)|暂时没有打上财富悬赏,、、、、
(10-12-13-14)
1、|(11/12)-(12/13)|+|(12/13)-(13/14)|+|(13/14)-(14/15)|+|(14/15)-(15/16)|2、0.0125*(16/5)-(1/7)*(-87.5)/(15/16)*(16/15)+(-2)²-43、(1/2)+1+(1/2)=2,(1/3)+(2/3)+1+(2/3)
( )/1+( )/1+( )/1等于14/13
-8×(+12)×(-7)÷13 -14+(1-0.5)*三分之一*(3-9)
1/13+12/13*(2.5-1/3) 计算
13-48×(1/12+1/16)
(-5)*13/3+(-5)*(-13/2)-5*13/1+0.125*(-13/14)*(-8)
|1/11-1/12|+|1/12-1/13|+|1/13-1/14+|1/14-1/15|
数学计算题(设元法)(1/11+1/12+1/13+1/14+1/15)*(1/12+1/13+1/14+1/15+1/16)-(1/11+1/12+1/12+1/14+1/15+1/16)*(1/12+1/13+1/14+1/15)
12个13分之1是( )
1/10*11+1/11*12+1/12*13+1/13*14+1/14*15等于?