3元2次方程5x+6y+z平方=1000x平方-6y+5z=802x-2y平方+3z=100
问题描述：
3元2次方程
5x+6y+z平方=1000
x平方-6y+5z=80
2x-2y平方+3z=100
答
x =15.345448036922244965538888830974+1.5860871531664525933594783719575*i1.0347020856045104425541246867052+8.2610913634421353383680220889311*i-.63992701056257250902008256593629+9.5027151419558243497763...