y=-110x²+385x-275
a=-110 b=385
于是
对称轴
x=-b/2a=-385/(2*110)=-385/220=-77/44=-7/4
求算对称轴跪求y=-110x²+385x-275的对称轴,有急用呃呃呃呃呃呃呃呃呃，你们剪刀石头布吧QAQ，还是我小公鸡
y=-110x²+385x-275
a=-110 b=385
于是
对称轴
x=-b/2a=-385/(2*110)=-385/220=-77/44=-7/4