n=1/a1+1/a2+1/a3+1/a4,其中n,a1,a2,a3,a4∈N+,a1<a2<a3<a
n=1/a1+1/a2+1/a3+1/a4,其中n,a1,a2,a3,a4∈N+,a1<a2<a3<a4<30,则满足条件的数列a1,a2,a3,a4的个数是?...
n=1/a1+1/a2+1/a3+1/a4,其中n,a1,a2,a3,a4∈N+,a1<a2<a3<a4<30 ,则满足条件的数列a1,a2,a3,a4的个数是?
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