<=> \(\frac{3\left(2x+1\right)^2}{15}-\frac{5\left(x-1\right)^2}{15}-\frac{7x^2-14x-5}{15}=0\)

<=> \(\frac{12x^2+12x+3}{15}-\frac{5x^2-10x+5}{15}-\frac{7x^2-14x-5}{15}=0\)

<=> \(\frac{12x^2+12x+3-5x^2+10x-5-7x^2+14x+5}{15}=0\)

=> 36x + 3 = 0

<=> 36x = -3

<=> x = -1/12

Vậy S = { -1/12 }

\(\frac{\left(2x+1\right)^2}{5}-\frac{\left(x-1\right)^2}{3}=\frac{7x^2-14x-5}{15}\)

\(\Leftrightarrow\frac{4x^2+4x+1}{5}-\frac{x^2-2x+1}{3}=\frac{7x^2-14x-5}{15}\)

\(\Leftrightarrow\frac{12x^2+12x+3}{15}-\frac{5x^2-10x+5}{15}=\frac{7x^2-14x-5}{15}\)

\(\Leftrightarrow12x^2+12x+3-5x^2+10x-5-7x^2+14x+5=0\)

\(\Leftrightarrow36x+3=0\Leftrightarrow x=-\frac{3}{36}=-\frac{1}{12}\)

Đưa pt a, có msc là 15 xong quy đồng rồi có cùng mẫu là 15 ta bỏ mẫu (Đl) rồi chuyển vế

b, tương tự

a) \(\frac{x+\frac{x+1}{5}}{3}=1-\frac{2x-\frac{1-2x}{34}}{5}\)

\(\Leftrightarrow\frac{\frac{5x+x+1}{5}}{3}=1-\frac{\frac{68x-1+2x}{34}}{5}\)

\(\Leftrightarrow\frac{6x+1}{15}=1-\frac{70-1}{170}\)

\(\Leftrightarrow\frac{6x+1}{15}+\frac{70x-1}{170}-1=0\)

\(\Leftrightarrow\frac{34\left(6x+1\right)+3\left(70x-1\right)-510}{510}=0\)

\(\Leftrightarrow204x+34+210x-3-510=0\)

\(\Leftrightarrow414x-479=0\)

\(\Leftrightarrow x=\frac{479}{414}\)

Vậy tập nghiệm của phương trình là \(S=\left\{\frac{479}{414}\right\}\)

bạn ơi bạn làm được câu c chưa 

b) \(\frac{\left(2x+1\right)^2}{5}-\frac{\left(x-1\right)^2}{3}=\frac{7x^2-14x-5}{15}\)

\(\Leftrightarrow\frac{4x^2+4x+1}{5}-\frac{x^2-2x+1}{3}-\frac{7x^2-14x-5}{15}=0\)

\(\Leftrightarrow\frac{3\left(4x^2+4x+1\right)-5\left(x^2-2x+1\right)-7x^2+14x+5}{15}=0\)

\(\Leftrightarrow12x^2+12x+3-5x^2+10x-5-7x^2+14x+5=0\)

\(\Leftrightarrow36x+3=0\)

\(\Leftrightarrow x=-\frac{1}{12}\)

Vậy tập nghiệm của phương trình là \(S=\left\{-\frac{1}{12}\right\}\)

c) \(\frac{2x-1}{2}+\frac{2x+1}{3}=\frac{2x+7}{6}+\frac{2x+9}{7}\)

\(\Leftrightarrow\left(\frac{2x-1}{2}-2\right)+\left(\frac{2x+1}{3}-2\right)=\left(\frac{2x+7}{6}-2\right)+\left(\frac{2x+9}{7}-2\right)\)

\(\Leftrightarrow\frac{2x-5}{2}+\frac{2x-5}{3}=\frac{2x-5}{6}+\frac{2x-5}{7}\)

\(\Leftrightarrow\frac{2x-5}{2}+\frac{2x-5}{3}-\frac{2x-5}{6}-\frac{2x-5}{7}=0\)

\(\Leftrightarrow\left(2x-5\right)\left(\frac{1}{2}+\frac{1}{3}-\frac{1}{6}-\frac{1}{7}\right)=0\)

Mà \(\frac{1}{2}+\frac{1}{3}-\frac{1}{6}-\frac{1}{7}\ne0\)

\(\Leftrightarrow2x-5=0\)

\(\Leftrightarrow x=\frac{5}{2}\)

Vậy tập nghiệm của phương trình là \(S=\left\{\frac{5}{2}\right\}\)

giup minh voi cac bạn

\(\dfrac{\left(2x+1\right)^2}{5}-\dfrac{\left(x-1\right)^2}{3}=\dfrac{7x^2-14x-5}{15}\) 

⇔ \(\dfrac{3\left(2x+1\right)^2}{15}-\dfrac{5\left(x-1\right)^2}{15}=\dfrac{7x^2-14x-5}{15}\)

⇔ \(3\left(2x+1\right)^2-5\left(x-1\right)^2=7x^2-14x-5\)

⇔ \(3\left(4x^2+4x+1\right)-5\left(x^2-2x+1\right)=7x^2-14x-5\)

⇔ \(12x^2+12x+3-5x^2+10x-5=7x^2-14x-5\)

⇔ \(7x^2+22x-2=7x^2-14x-5\) ⇔ \(36x+3=0\) ⇔ x=\(\dfrac{-1}{12}\)

\(\Leftrightarrow3\left(4x^2+4x+1\right)-5\left(x^2-2x+1\right)=7x^2-14x-5\)

\(\Leftrightarrow12x^2+12x+3-5x^2+10x-5-7x^2+14x+5=0\)

\(\Leftrightarrow36x=-3\)

hay x=-1/12

\(\frac{\left(2x+1\right)^2}{5}-\frac{\left(x-1\right)^2}{3}< \frac{7x^2-14x-5}{15}\)
\(\Leftrightarrow\frac{3\left(2x+1\right)^2}{15}-\frac{5\left(x-1\right)^2}{15}< \frac{7x^2-14x-5}{15}\)
\(\Rightarrow3\left(2x+1\right)^2-5\left(x-1\right)^2< 7x^2-14x-5\)
\(\Leftrightarrow3\left(4x^2+4x+1\right)-5\left(x^2-2x+1\right)< 7x^2-14x-5\)
\(\Leftrightarrow\left(12x^2+12x+3\right)-\left(5x^2-10x+5\right)< 7x^2-14x-5\)
\(\Leftrightarrow12x^2+12x+3-5x^2+10x-5< 7x^2-14x-5\)
\(\Leftrightarrow7x^2+22x-2< 7x^2-14x-5\)
\(\Leftrightarrow7x^2+22x-2-7x^2+14x+5< 0\)
\(\Leftrightarrow36x+3< 0\)
\(\Leftrightarrow36x< -3\)
\(\Leftrightarrow x< -\frac{3}{36}\)
\(\Leftrightarrow x< -\frac{1}{12}\)

bn ơi kl phải là <=>x >\(-\frac{1}{12}\)