设另一个因式为 x+my+n 即X^2+xy-2y^2+8x+10y+k =(X+2Y+2)(x+my+n)= x² +(m+2)xy +2my²+ (n+2)x + (2n+2m)y +2n 等式两边对应项系数相等,即 m+2=1 ,可得m= -1 n+2 =8,可得n=6 2n=k,所以k=12
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