化简 (5n-2)3n-(5n-2)(n-1)

解答

化简

(5 n - 2) 3 n - (5 n - 2) (n - 1)

10 n^{2} + n - 2

求解步骤

(5 n - 2) \cdot 3 n - (5 n - 2) (n - 1)

= 3 n (5 n - 2) - (5 n - 2) (n - 1)

展开

3 n (5 n - 2) : 15 n^{2} - 6 n

= 15 n^{2} - 6 n - (5 n - 2) (n - 1)

展开

- (5 n - 2) (n - 1) : - 5 n^{2} + 7 n - 2

= 15 n^{2} - 6 n - 5 n^{2} + 7 n - 2

对同类项分组

= 15 n^{2} - 5 n^{2} - 6 n + 7 n - 2

\frac{∣ 3 x - 1 ∣}{x + 2} > - 1

s im pl i f y 8 - 3

\frac{x}{3} + 10 = 15

s im pl i f y \frac{3}{10} + \frac{1}{5}

\frac{18}{2} = 2 n