解方程:2x²-7x+2+7/x+2/x²=0
问题描述:
解方程:2x²-7x+2+7/x+2/x²=0
答
2(x-1/x)^2+4-7(x-1/x)+2=0
2(x-1/x)^2-7(x-1/x)+6=0
x-1/x=2或x-1/x=3/2
x=1±√2或x=2或x=-1/2