展开 21(2+2/3 x)

解答

展开

21 (2 + \frac{2}{3} x)

42 + 14 x

求解步骤

21 (2 + \frac{2}{3} x)

使用分配律:

a (b + c) = ab + a c

21 (2 + \frac{2}{3} x) = 21 \cdot 2 + 21 \cdot \frac{2}{3} x

= 21 \cdot 2 + 21 \cdot \frac{2}{3} x

化简

21 \cdot 2 + 21 \cdot \frac{2}{3} x : 42 + 14 x

= 42 + 14 x

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