展开 4(16-3pi)cm^2

解答

展开

4 (16 - 3 π) c m^{2}

64 c m^{2} - 12 π c m^{2}

求解步骤

4 (16 - 3 π) c m^{2}

使用分配律:

a (b - c) = ab - a c

a = 4 c m^{2}, b = 16, c = 3 π

= 4 c m^{2} \cdot 16 - 4 c m^{2} \cdot 3 π

= 4 \cdot 16 c m^{2} - 4 \cdot 3 π c m^{2}

化简

4 \cdot 16 c m^{2} - 4 \cdot 3 π c m^{2} : 64 c m^{2} - 12 π c m^{2}

= 64 c m^{2} - 12 π c m^{2}

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