当X=4时,由A=aX^2-4X-6a=-1得a=1.5所以当X=-5时,A=1.5x25+4x5-6x1.5=48.5
当返陪野x=-5时乱没ax2-4x-6a=-125a-(-20)-6a=-125a-6a=-1-2019a=-21a=-21÷19a=-21/漏喊19
把x=4带入 求出a=1.5 A=1.5x²+4x-9 x=-5 A=48.5
如图碰野所示瞎吵碧磨举
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