y=[100-(x-20)*10]*(x-18)计算过程
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y=[100-(x-20)*10]*(x-18)计算过程y=[100-(x-20)*10]*(x-18)计算过程y=[100-(x-20)*10]*(x-18)计算过程解y=[100-(x-20)*1
y=[100-(x-20)*10]*(x-18)计算过程
y=[100-(x-20)*10]*(x-18)计算过程
y=[100-(x-20)*10]*(x-18)计算过程
解 y=[100-(x-20)*10]*(x-18)
=[100-10(x-20)](x-18)
=[100-10x+200](x-18)
=(300-10x)(x-18)
=300x-5400-10x^2+180x
=-10x^2+480x-5400
y=[100-(x-20)*10]*(x-18)
=[100-10x+200]*(x-18)
=(-10x+300)(x-18)
=-10x²+480x-5400