展开 sqrt(7)(sqrt(5)+1)

解答

展开

7 (5 + 1)

35 + 7

十进制

8.56183 \dots

求解步骤

7 (5 + 1)

使用分配律:

a (b + c) = ab + a c

7 (5 + 1) = 75 + 7 \cdot 1

= 75 + 7 \cdot 1

75 + 7 \cdot 1 = 35 + 7

= 35 + 7

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