展开 4e^2f(5e^3f-4)

解答

展开

4 e^{2} f (5 e^{3} f - 4)

20 e^{5} f^{2} - 16 e^{2} f

求解步骤

4 e^{2} f (5 e^{3} f - 4)

使用分配律:

a (b - c) = ab - a c

a = 4 e^{2} f, b = 5 e^{3} f, c = 4

= 4 e^{2} f \cdot 5 e^{3} f - 4 e^{2} f \cdot 4

= 4 \cdot 5 e^{3} e^{2} ff - 4 \cdot 4 e^{2} f

化简

4 \cdot 5 e^{3} e^{2} ff - 4 \cdot 4 e^{2} f : 20 e^{5} f^{2} - 16 e^{2} f

= 20 e^{5} f^{2} - 16 e^{2} f

\frac{d}{d b} ((c) (a^{2} + b^{2}))

e x p an d (x - 8)^{4}

e x p an d \frac{6 x}{( 1 - x ) ^{3}}

e x p an d 7348 \times 4

e x p an d (1, 2, - 4) l e f t (1, 2, - 4)