如图所示.A2,A3是线段A1A4上两点,且A1A2=a1,A1A3=a2,A1A4=a3.求线段A1A4上所有线段之和
圆内接正七边形A1A2A3A4A5A6A7,证明:1/A1A2=1/A1A3+1/A1A4
已知A1A2A3A4A5A6A7是圆内接正七边形,求证:1/边A1A2=1/边A1A3+1/边A1A4
已知A1A2A3A4A5A6A7是圆内接正七边形,求证:1/A1A2=1/A1A3+1/A1A4
设A1A2A3A4A5A6A7是圆内接正七边形,求证:1/A1A2=1/A1A3+1/A1A4 .
已知A1A2A3A4A5A6A7是圆内接正七边形,求证;1/A1A2=1/A1A3+1/A1A4
若等差数列{an}的公差d≠0,且a1,a3,a7成等比数列,则a1a4=( )
如图所示,点A1,A2,A3在x轴上,且OA1=A1A2=A2A3,分别过点A1,A2,A3作y轴的平行线.
如图,点A1,A2,A3在x轴上,且OA1=A1A2=A2A3
求面积如图,点A1、A2、A3在x轴上,且OA1=A1A2=A2A3,
实数a1,a2,a3,b1,b2,b3满足a1+a2+a3=b1+b2+b3,a1a2+a2a3+a1a3=b1b2+b
设a1,a2,a3都不为0,若1/a1a2+1/a2a3=2/a1a3,证明a1,a2,a3成等差数列
已知等差数列{an}中,S10=110,a2^2=a1a4,求数列{an}的通项公式.