y=4000*(4200-x^2)*•x/4500-2000[1-(4200-x^2/4500)] *x的计算过程。 过程，急急

y=4000*(4200-x^2)*•x/4500-2000[1-(4200-x^2/4500)] *x的计算过程。 过程，急急

y=4000*(4200-x^2)*•x/4500-2000[1-(4200-x^2/4500)] *x
=8x(4200-x²)/9-4x(4500-4200+x²)/9
=(33600x-8x³+1200x-4x³)/9
=(34800x-12x³)9
y =(11600x-4x³)/9追问错了追答y=4000*(4200-x^2)*•x/4500-2000[1-(4200-x^2/4500)] *x
=8x(4200-x²)/9-4x(4500-4200+x²)/9
=(33600x-8x³+1200x-4x³)/9
=(34800x-12x³)/9
y =(11600x-4x³)/3追问还是不一样

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