Bạn tham khảo:
a/ $\sqrt{x+2}=5$
⇔$x+2=25$
⇔$x=23$
b/$\sqrt{2x}+3$$\sqrt{8x}-$$\frac{2}{5}$$\sqrt{50x}=33$
⇔$\sqrt{2x}+6$$\sqrt{2x}-2$$\sqrt{2x}=33$
⇔$5\sqrt{2x}=33$
⇔$\sqrt{2x}=$$\frac{33}{5}$
⇔$x=$$\frac{1089}{50}$
c/$\sqrt{x+1}+3$$\sqrt{4x+4}-$$\frac{2}{5}$ $\sqrt{25x+25}=50$
⇔$\sqrt{x+1}+6$$\sqrt{x+1}-2$$\sqrt{x+1}=50$
⇔$5\sqrt{x+1}=50$
⇔$\sqrt{x+1}=10$
⇔$x=99$
HỌC TỐT
