1.复合求导
lny=2(2+x^3)^(2-1)*(2+x^3)'
=2(2+x^3)*3x^(3-1)
=6x^2（2+x^3）
2.也是复合求导
=8(1+2x^2)^（8-1）*(1+2x^2)'
=8(1+2x^2)^7*2*2x^(2-1)
=8(1+2x^2)^7*2*2x^(2-1)
=32x(1+2x^2)^7
3.y'=(x-1)'*(x-2)(x-3)...(x-100)+(x-2)'*(x-1)(x-3)...(x-100)+.+(x-100)'*(x-1)(x-2)...(x-99)
=(x-2)(x-3)...(x-100)+(x-1)(x-3)...(x-100)+(x-1)(x-2)(x-4)...(x-100)+(x-1)(x-2)...(x-99)
=[1/(x-1)+1/(x-2)+…+1/（x-100)](x-1)(x-2)…(x-100)