前>>209訂正。
>>206
y=3(x^7+5x^5+2x^3+20)^200
y'=600(x^7+5x^5+2x^3+20)^199(7x^6+25x^4+6x^2)

y=(4x^5+2x^6+10)(3x^3+5x)^10
y'=(20x^4+12x^5)(3x^3+5x)^10+(4x^5+2x^6+10)10(3x^3+5x)^9(9x^2+5)
　=4(3x+5)(3x^2+5)^10x^14+10(2x^6+4x^5+10)(3x^2+5)^9(9x^2+5)x^9