嘿嘿抄假设袭2个根分别为x1,x2 则x1+x2=-(2k+1)x1x2=k²-2x1²+x2²=(x1+x2)²-2x1x2=(2k+1)²-2(k²-2)=2k²+4k+5=112k²+4k-6=0(k+3)(2k