展开 sqrt(2)(sqrt(7)+4)

解答

展开

2 (7 + 4)

14 + 42

十进制

9.39851 \dots

求解步骤

2 (7 + 4)

使用分配律:

a (b + c) = ab + a c

2 (7 + 4) = 27 + 2 \cdot 4

= 27 + 2 \cdot 4

27 + 2 \cdot 4 = 14 + 42

= 14 + 42

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