化简-10(5sqrt(2)-8)

解答

化简

- 10 (52 - 8)

- 502 + 80

十进制

9.28932 \dots

求解步骤

- 10 (52 - 8)

使用分配律:

a (b - c) = ab - a c

- 10 (52 - 8) = - 10 \cdot 52 - (- 10) \cdot 8

= - 10 \cdot 52 - (- 10) \cdot 8

- 10 \cdot 52 - (- 10) \cdot 8 = - 502 + 80

= - 502 + 80

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