设定价为X元,利润为Y元,
Y=[100-10(X-10)](X-8)
=(200-10X)(X-8)
=-10(X-20)(X-8)
=-10(X^2-28X+160)
=-10[(X-14)^2-36]
=-10(X-14)^2+360,
a=-10
设定价为X元,利润为Y元,
Y=[100-10(X-10)](X-8)
=(200-10X)(X-8)
=-10(X-20)(X-8)
=-10(X^2-28X+160)
=-10[(X-14)^2-36]
=-10(X-14)^2+360,
a=-10