Toán 5*căn bậc hai(15*x) – căn bậc hai(15*x) + 2*căn bậc hai(15*x) = 2 (x_>0) 02/07/2021 By Aubrey 5*căn bậc hai(15*x) – căn bậc hai(15*x) + 2*căn bậc hai(15*x) = 2 (x_>0)
ĐKXĐ: $x\geq0$ $5\sqrt{15x}-\sqrt{15x}+2\sqrt{15x}=2$ ⇔$6\sqrt{15x}=2$ ⇔$\sqrt{15x}=\frac{1}{3}$ ⇔$15x=\frac{1}{9}$ ⇔$x=\frac{1}{135}$ (t/m) Vậy $x=\frac{1}{135}$ Trả lời
Đáp án: `5sqrt{15x}-sqrt{15x}+2sqrt{15x}=2(x>=0)` `<=>6sqrt{15x}=2` `<=>sqrt{15x}=1/3` `<=>15x=1/9` `<=>x=1/135(tmđk)` Vậy `S={1/135}.` Trả lời
ĐKXĐ: $x\geq0$
$5\sqrt{15x}-\sqrt{15x}+2\sqrt{15x}=2$
⇔$6\sqrt{15x}=2$
⇔$\sqrt{15x}=\frac{1}{3}$
⇔$15x=\frac{1}{9}$
⇔$x=\frac{1}{135}$ (t/m)
Vậy $x=\frac{1}{135}$
Đáp án:
`5sqrt{15x}-sqrt{15x}+2sqrt{15x}=2(x>=0)`
`<=>6sqrt{15x}=2`
`<=>sqrt{15x}=1/3`
`<=>15x=1/9`
`<=>x=1/135(tmđk)`
Vậy `S={1/135}.`