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](/uploads/image/z/1263484-28-4.jpg?t=y%3D%5B100-%28x-20%29%2A10%5D%2A%28x-18%29%E8%AE%A1%E7%AE%97%E8%BF%87%E7%A8%8B)
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