展开 3*pi(80sqrt(5)-64)

解答

展开

3 \cdot π (805 - 64)

2405 π - 192 π

十进制

1082.76974 \dots

求解步骤

3 π (805 - 64)

使用分配律:

a (b - c) = ab - a c

a = 3 π, b = 805, c = 64

= 3 π 805 - 3 π 64

= 3 \cdot 805 π - 3 \cdot 64 π

化简

3 \cdot 805 π - 3 \cdot 64 π : 2405 π - 192 π

= 2405 π - 192 π

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