解方程 n(n+1)=n2+5n+6-n(n+1)解;

问题描述:

解方程 n(n+1)=n2+5n+6-n(n+1)解;

n(n+1)=n²+5n+6-n(n+1)n(n+1)+n(n+1)=n²+5n+62n(n+1)=n²+5n+62n²+2n=n²+5n+6n²-3n-6=0n²-3n+9/4-9/4-6=0(n-3/2)²-33/4=0(n-3/2-√33/2)(n-3/2+√33/2)=0n=3/2+√...