展开 sqrt(3)(5-4sqrt(2))

解答

展开

3 (5 - 42)

53 - 46

十进制

- 1.13770 \dots

求解步骤

3 (5 - 42)

使用分配律:

a (b - c) = ab - a c

3 (5 - 42) = 3 \cdot 5 - 3 \cdot 42

= 3 \cdot 5 - 3 \cdot 42

3 \cdot 5 - 3 \cdot 42 = 53 - 46

= 53 - 46

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