-1<= 2x+5\land 2x+3<11

解答

- 1 \leq 2 x + 5 and 2 x + 3 < 11

- 3 \leq x < 4

间隔符号

[- 3, 4)

求解步骤

- 1 \leq 2 x + 5 and 2 x + 3 < 11

- 1 \leq 2 x + 5 : x \geq - 3

2 x + 3 < 11 : x < 4

合并区间

x \geq - 3 and x < 4

合并重叠的区间

- 3 \leq x < 4

2.5 (h - 1) \geq 15

x > 10 lo g_{10} (x)

f a c t or 2 x^{3} - 18 x^{2} + 40 x

\frac{x + 17}{5} - \frac{3 x - 7}{4} = - 2

12 x + 3 = 11 x + 9