解
y‘=(5x+1)’(2x²-3)+(5x+1)(2x²-3)‘
=5(2x²-3)+4x(5x+1)
=10x²-15+20x²+4x
=30x²+4x-15
y=f(x)g(x)
∴y'=f’(x)g(x)+f(x)g'(x)