抛物线y=ax²+bx+c(a<0),与X轴的交点分别为(-1,0),(3,0),则a分之c等于?
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抛物线y=ax²+bx+c(a<0),与X轴的交点分别为(-1,0),(3,0),则a分之c等于?
抛物线y=ax²+bx+c(a<0),与X轴的交点分别为(-1,0),(3,0),则a分之c等于?
抛物线y=ax²+bx+c(a<0),与X轴的交点分别为(-1,0),(3,0),则a分之c等于?
y=a(x+1)(x-3)
y=ax²-2ax-3a
-2a=b、-3a=c
c/a=-3