化简 2(1-sqrt(5))

解答

化简

2 (1 - 5)

2 - 25

十进制

- 2.47213 \dots

求解步骤

2 (1 - 5)

使用分配律:

a (b - c) = ab - a c

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

= 2 \cdot 1 - 25

数字相乘:

2 \cdot 1 = 2

= 2 - 25

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