Rút gọn P với `a<=1` `P=``\sqrt{\frac{15}{2}}.``\sqrt{\frac{10(a-1)^2}{3}}`
2 câu trả lời
`P=\sqrt{15/2}.\sqrt{(10(a-1)^2)/3}`
`->P=\sqrt{(15.10(a-1)^2)/(2.3)}`
`->P=\sqrt{(150.(a-1)^2)/6}`
`->P=\sqrt{25.(a-1)^2}`
`->P=\sqrt{25}.\sqrt{(a-1)^2}`
`->P=\sqrt{5^2}.\sqrt{(a-1)^2}`
`->P=|5|.|a-1|`
`->P=5.(1-a)(a<=1)`
$P=\sqrt{\dfrac{15}{2}}.\sqrt{\dfrac{10\left(a-1\right)^2}{3}}$ $(a \leq 1)$
$=\sqrt{\dfrac{15}{2}}\dfrac{\sqrt{10}\left(a-1\right)}{\sqrt{3}}$
$=\dfrac{\sqrt{10}\left(a-1\right)\sqrt{\dfrac{15}{2}}}{\sqrt{3}}$
$=\dfrac{\sqrt{10}\dfrac{\sqrt{15}}{\sqrt{2}}\left(a-1\right)}{\sqrt{3}}$
$=\dfrac{5\sqrt{3}\left(a-1\right)}{\sqrt{3}}$
$=5\left(1-a\right)$ $(a \leq 1)$
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