展开 2pi(2x-1)

解答

展开

2 π (2 x - 1)

4 π x - 2 π

求解步骤

2 π (2 x - 1)

使用分配律:

a (b - c) = ab - a c

a = 2 π, b = 2 x, c = 1

= 2 π 2 x - 2 π 1

= 2 \cdot 2 π x - 2 \cdot 1 π

化简

2 \cdot 2 π x - 2 \cdot 1 π : 4 π x - 2 π

= 4 π x - 2 π

e x p an d \frac{5 ( 192 3 - 421 )}{22}

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