3dsmax9注册码:1/6,1,5,20,60,()
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1/6,1,5,20,60,()
A.180B.150
C.120D.90
A.180B.150
C.120D.90
分别是6 5 4 3 2
所以选C
1/6*(6)=1, 1*(5)=5, 5*(4)=20, 20*(3)=60, 60*(2) =120 所以是C
1/6,1,5,20,60,()
1-1/2-1/3-1/4-1/5-1/6-1/7-1/8-......-1/17-1/18-1/19-1/20=?
1/2+1/6+1/12+1/20+1/30
1/6+1/24+1/60+1/40=
"1/3+1/(3+4)+1/(3+4+5)+1/(3+4+5+6)+......1/(3+4+5+6+7+8+9+10+......+18+19+20)的值是多少?"
"1/3+1/(3+4)+1/(3+4+5)+1/(3+4+5+6)+......+1/(3+4+5+6+7+8+9+10+......+18+19+20)的值是多少?"
“1/3+1/(3+4)+1/(3+4+5)+1/(3+4+5+6)+。。。。。+1/(3+4+5+6+7+......+20)的结果及数学解题步骤!”
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=?
1/2+1/4+1/6+......1/20=?