化简 9(3x+8)-3(4x+21)

解答

化简

9 (3 x + 8) - 3 (4 x + 21)

15 x + 9

求解步骤

9 (3 x + 8) - 3 (4 x + 21)

展开

9 (3 x + 8) : 27 x + 72

= 27 x + 72 - 3 (4 x + 21)

展开

- 3 (4 x + 21) : - 12 x - 63

= 27 x + 72 - 12 x - 63

对同类项分组

= 27 x - 12 x + 72 - 63

\frac{31}{20}

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e x p an d (n^{2} + 4) (n - 1)

f a c t or (x + 4 b) (x - 1) + y (x - 1)

s im pl i f y 1 + 3 4 + 4