化简 2(sqrt(5)-1)

解答

化简

2 (5 - 1)

25 - 2

十进制

2.47213 \dots

求解步骤

2 (5 - 1)

使用分配律:

a (b - c) = ab - a c

2 (5 - 1) = 25 - 2 \cdot 1

= 25 - 2 \cdot 1

数字相乘:

2 \cdot 1 = 2

= 25 - 2

e x p an d \frac{1}{25} (e^{5 x} \cdot 5 x - e^{5 x})

e x p an d (22 + 2) i

\frac{d}{d s} ((x (s, t)) (s + t))

s im pl i f y (7 cos (x) + 1)^{2}

\frac{\partial}{\partial x} ((z) (x^{2} + y^{2} - z^{2}))