m^2+n^2=7,m+n=3
﹙m+n﹚²=3²
m²﹢2mn+n²=9
7+2mn=9
mn=2
∵m+n=3 mn=2
∴m₁=1.m₂=2
n₁=2 n₂=1
m^5+n^5=2^5+1^5=33