展开 dx(3x^2y+2x)

解答

展开

d x (3 x^{2} y + 2 x)

3 x^{2} y d x + 2 x d x

求解步骤

d x (3 x^{2} y + 2 x)

使用分配律:

a (b + c) = ab + a c

a = d x, b = 3 x^{2} y, c = 2 x

= d x \cdot 3 x^{2} y + d x \cdot 2 x

= 3 x^{2} y d x + 2 x d x

e x p an d (2 y^{'} (x) - 4) (y + 2 x)

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