Đáp án:
a) x $\geq$ $\frac{3}{2}$
b) x $\leq$ $\frac{4}{5}$
c) x > 1
d) x > -1
e) x < 3
Giải thích các bước giải:
a) $\sqrt{2x-3}$ $\geq$ 0
⇔ 2x-3 $\geq$ 0
⇔2x $\geq$ 3
⇔x $\geq$ $\frac{3}{2}$
b) $\sqrt{4-5x}$ $\geq$ 0
⇔4-5x $\geq$ 0
⇔5x $\leq$ 4
⇔x $\leq$ $\frac{4}{5}$
c) $\sqrt{\frac{-3}{3-3x}}$ $\geq$ 0
⇔3x - 3 < 0
⇔3x > 3
⇔x > 1
d) $\sqrt{\frac{2}{x+1}}$ $\geq$ 0
⇔x + 1 > 0
⇔x > -1
e) $\sqrt{\frac{x-3}{-3}}$ $\geq$ 0
⇔x - 3 < 0
⇔x < 3
