展开 sqrt(2)(3-4sqrt(5))

解答

展开

2 (3 - 45)

32 - 410

十进制

- 8.40646 \dots

求解步骤

2 (3 - 45)

使用分配律:

a (b - c) = ab - a c

2 (3 - 45) = 2 \cdot 3 - 2 \cdot 45

= 2 \cdot 3 - 2 \cdot 45

2 \cdot 3 - 2 \cdot 45 = 32 - 410

= 32 - 410

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