Toán $\frac{5}{2}$ – $\frac{1}{2}$ ($x^{2}$ -5)=$\frac{1}{2}$ 10/10/2021 By Ivy $\frac{5}{2}$ – $\frac{1}{2}$ ($x^{2}$ -5)=$\frac{1}{2}$
`5/2-1/2(x^2-5)=1/2` `⇔1/2(x^2-5)=5/2-1/2` `⇔1/2(x^2-5)=4/2` `⇔x^2-5=4/2 : 1/2` `⇔x^2-5=4` `⇔x^2=9` `⇔x=±3` Trả lời
`5/2-1/2(x^2-5)=1/2`
`⇔1/2(x^2-5)=5/2-1/2`
`⇔1/2(x^2-5)=4/2`
`⇔x^2-5=4/2 : 1/2`
`⇔x^2-5=4`
`⇔x^2=9`
`⇔x=±3`
5/2-(x^2-5)/2=1/2 →(5-x^2+5)/2=1/2 →(10-x^2)/2=1/2 →10-x^2=1 →x^2=9 →x=3 hoặc x=-3