化简-21(a+2b)+14a-9b

解答

化简

- 21 (a + 2 b) + 14 a - 9 b

- 7 a - 51 b

求解步骤

- 21 (a + 2 b) + 14 a - 9 b

展开

- 21 (a + 2 b) : - 21 a - 42 b

= - 21 a - 42 b + 14 a - 9 b

对同类项分组

= - 21 a + 14 a - 42 b - 9 b

6 x^{2} + 12 x - 48 = 0

s im pl i f y 2 5^{2}

\frac{3}{7} + \frac{2 x}{5} = - \frac{x}{5} + 1

∣ x + 9 ∣ \leq 4

s im pl i f y 21 \cdot 9