解设f(x)=x²-4mx+2m+6,A交B不等于空集即f(x)与x轴负半轴有交点,则有△=16m²-4(2m+6)=8(2m²-m-3)=8(m+1)(2m-3)≥0解得m≥3/2或m≤-1f(x)图像是条开口向上,对称轴为x=2m的抛物线当m≥0时,要使f(x)与x轴...