1×4/1+4×7/1+7×10/1……+22×25/1+25×28/1=?
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1×4/1+4×7/1+7×10/1……+22×25/1+25×28/1=?
1×4/1+4×7/1+7×10/1……+22×25/1+25×28/1=?
1×4/1+4×7/1+7×10/1……+22×25/1+25×28/1=?
1×4/1+4×7/1+7×10/1……+22×25/1+25×28/1=
=(1/3)[(1/1-1/4)+(1/4-1/7)+(1/7-1/10)+.+(1/22-1/25)+(1/25-1/28)]
=(1/3)(1-1/28)
=(1/3)*(27/28)
=9/28
=1/3×(1-1/4+1/4-1/7+……+1/25-1/28)
=1/3×(1-1/28)
=1/3×27/28
=9/28
1×4/1+4×7/1+7×10/1……+22×25/1+25×28/1
=(1-4/1+4/1-7/1+7/1-10/1+……+22/1-25/1+25/1-28/1)÷3
=(1-28/1)÷3
=28/27÷3
=28/9
1*4+4*7+7*10……+49*52
1/1×4+1/4×7+1/7×10+……+1/91×94 等于?
1*1/4+4*1/7+7*1/10+……+2002*1/2005 咋算k
1/(1*4)+1/(4*7)+1/(7*10)+……+1/(97*100)
1/1*4+1/4*7+1/7*10+1/10*13+…+1/298*301
1/1×4+1/4×7+1/7×10+…+1/97×100
1/1*4+1/4*7+1/7*10+…+1/97*100的简便运算
1+4+7+10+13+16+……+97+100
1+4+7+10+……+292+295+298
1+4+7+10+……+295+298=?
数列1,4,7,10…… 求1+4+7+10+……+73的值?
1/(1*4)+1/(4*7)+1/(7*10)+……+1/[(3n-2)(3n+1)]求和
计算:1/1×4+1/4×7+1/7×10+……+1/2002×2005+1/2005×2008
1×4/1+4×7/1+7×10/1……+22×25/1+25×28/1=?
4×7/1+7×10/1+……+100×103/1
求这个式子的值,1×4/1+4×7/1+7×10/1+……+91×94/1,
1*4分之1+4*7分之1+7-10分之1+……91*94分之1
1×4分之1+4×7分之1+7×10分之1+……+100×103分之1