展开 (2x^3+3xy^2)dy

解答

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

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

求解步骤

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

使用分配律:

a (b + c) = ab + a c

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

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

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

e x p an d 21 (\frac{4}{7})

e x p an d \frac{1}{5 \cdot ( c + 1 )}

e x p an d \frac{( n - 1 ) n}{2}

e x p an d \frac{n + 3}{( n + 1 ) ( n + 2 )}

e x p an d A (- 5, 6) b (- 2, - 4)