a2+a3+a5=34,a2×a5=52,求公差d
问题描述:
a2+a3+a5=34,a2×a5=52,求公差d
答
a2+a3+a5=34a2+a2+d+a2+3d=343a₂+4d=34d=(34-3a₂)/4a2×a5=52a2×(a2+3d)=52a₂²+3a₂d=52a₂²+3a₂(34-3a₂)/4=524a₂²+3a₂(34-3a₂)=2084a&...