展开-sqrt(2)(5-6sqrt(7))

解答

展开

- 2 (5 - 67)

- 52 + 614

十进制

15.37887 \dots

求解步骤

- 2 (5 - 67)

使用分配律:

a (b - c) = ab - a c

- 2 (5 - 67) = - 2 \cdot 5 - (- 2) \cdot 67

= - 2 \cdot 5 - (- 2) \cdot 67

- 2 \cdot 5 - (- 2) \cdot 67 = - 52 + 614

= - 52 + 614

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