化简 (sqrt(2)-sqrt(7))2

解答

化简

(2 - 7) 2

22 - 27

十进制

- 2.46307 \dots

求解步骤

(2 - 7) \cdot 2

= 2 (2 - 7)

使用分配律:

a (b - c) = ab - a c

2 (2 - 7) = 22 - 27

= 22 - 27

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