bạn đăng tách ra nhé

a, \(x-\dfrac{3}{7}=\dfrac{1}{8}\Leftrightarrow x=\dfrac{1}{8}+\dfrac{3}{7}=\dfrac{31}{56}\)

b, \(-2x=\dfrac{1}{6}+\dfrac{3}{5}=\dfrac{23}{30}\Leftrightarrow x=\dfrac{23}{30}:\left(-2\right)=-\dfrac{23}{-60}\)

c, \(\left|2x-3\right|=\dfrac{1}{6}-\dfrac{1}{2}=\dfrac{-1}{3}\)( vô lí ) 

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a + b, A=\(\dfrac{x-3\sqrt{x}+2}{x-4\sqrt{x}+3}\) = \(\dfrac{\left(\sqrt{x}-1\right)\left(\sqrt{x}-2\right)}{\left(\sqrt{x}-1\right)\left(\sqrt{x}-3\right)}\)=\(\dfrac{\sqrt{x}-2}{\sqrt{x}-3}\)

ĐKXĐ: \(\sqrt{x}-3\)\(\Leftrightarrow\sqrt{x}\)\(\ne\)3\(\Leftrightarrow\) x\(\ne\)9

 

c, \(\dfrac{\sqrt{x}-2}{\sqrt{x}-3}=\dfrac{\sqrt{x}-3+1}{\sqrt{x}-3}=1+\dfrac{1}{\sqrt{x}-3}\Rightarrow\sqrt{x}-3\inƯ\left(1\right)=\left\{\pm1\right\}\)

ét o ét !!!

lam giup mk vs a

lam dung mk tich

      a³+2a²+a+2
<=>(a³+a)+(2a²+2)
<=>a(a²+1)+2(a²+1)
<=>(a²+1)(a+2)
Tích cho mình nha
Chúc bạn học tốt ~.~

alo trả lời đi mình tặng coin

Ta có : (x×2+x)×2-14(x×2+x)+24

= 3x×2-14×3x+24

= 6x-42x+24

= 24-36x

= 6(4-6x)

\(\dfrac{-x^{2n}y^{2n-1}}{\dfrac{1}{5}x^{2n-1}y^{2n-4}}=-5x^{-1}y^3=-\dfrac{1}{5}xy^3\)