若1/2+1/6+1/12+.+1/n[n+1]=19/20,则n=[ ].
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若1/2+1/6+1/12+.+1/n[n+1]=19/20,则n=[].若1/2+1/6+1/12+.+1/n[n+1]=19/20,则n=[].若1/2+1/6+1/12+.+1/n[n+1]=1
若1/2+1/6+1/12+.+1/n[n+1]=19/20,则n=[ ].
若1/2+1/6+1/12+.+1/n[n+1]=19/20,则n=[ ].
若1/2+1/6+1/12+.+1/n[n+1]=19/20,则n=[ ].
New Document
function test(){
var s = 0;
var n=1;
while(s < 19/20 )
{
s+= 1/(n*(n+1));
++n;
}
log.innerHTML = "n="+ n ;
}
window.onload = test;