化简 2(2+sqrt(15))

解答

化简

2 (2 + 15)

4 + 215

十进制

11.74596 \dots

求解步骤

2 (2 + 15)

使用分配律:

a (b + c) = ab + a c

2 (2 + 15) = 2 \cdot 2 + 215

= 2 \cdot 2 + 215

数字相乘:

2 \cdot 2 = 4

= 4 + 215

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