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)计算过程
y=[100-(x-20)*10]*(x-18)计算过程
数学人气:271 ℃时间:2020-04-16 12:59:24
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