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26×28×(1/26×27+1/27×28)求答案和过程, 谢谢!

带入括号内,得=2

26*28*(26*1/27+27*1/28) =26*28*(26/27+27/28) =26*28*26/27+26*28*27/28 =18928/27+702 ≈701.04+702 =1403.04

你应该抄错题了吧?我想原题应该是:26*28*(1/26*27+1/27*28) 那么~解题过程如下:26*28*(1/26*27+1/27*28)=26*28*1/(26*27)+26*28*1/(27*28)=28/27+26/27=(28+26)/27=2 注:1/A表示A份之一.希望能帮到您!~~

26X28X(26+1/27+1/27+28)=(27-1)X(27+1)X((27-1)+1/27+1/27+(27+1))=(27^2-1)X(27-1+1/27+1/27+27+1)=(27^2-1)X(27+27+1/27+1/27=(27^2-1)X2X(27+1/27)=2X(27^2-1)X(27^2+1)/27=2X(27^4-1)/27=2X(27^3-1/27)=2X(3^9-1/3^3)

26*28*(1/(26*27)+1/(27*28))=26*28*(1/26-1/*27+1/27-1/28)=26*28*(1/26-1/28)=28-26=2满意的话请及时点下采纳哟.:)~谢谢哈~

26*28*【1/(26*27)+1/(27*28)】=26*28*1/(26*27)+26*28*1/(27*28)=28/27+26/27=2

……楼上内容让人很无语……||| ---------------------- 原题:26*1/27+27*1/28 = 26/27+27/28 =(1-1/27)+(1-1/28) =2-(1/27+1/28) 之后的计算就比较容易了~

=26*28*(26*28+27*27)/(27*28)=26*[(27-1)(27+1)+27]/(27*28)=26*(27-1+27)/(27*28)=26/(27*28)

26*28*(26*27分之1+27*28分之1) =26*28*(26*1/27+27*1/28) =26*28*(26/27+27/28) =26*28*26/27+26*28*27/28 =28*26/27+26*27 =(27+1)*26/27+26*27 =27*26/27+26/27+26*27 =26+26/27+26*27 =26+26*27+26/27 =26(26+27)+676/27 =26*53+25+1/27 =1378+25+1/27 =1403+1/27

=26*27*(-1/28)=25you1/14

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