HOC24
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\(2x+x=\frac{11}{12}\)\(\)
\(\Rightarrow3x=\frac{11}{12}\)
\(\Rightarrow x=\frac{11}{12}\div3\)
\(\Rightarrow x=\frac{11}{36}\)
\(16x^2-8x+5=0\)
\(\Rightarrow\left(4x\right)^2-2.4x.1+1^2+4=0\)
\(\Rightarrow\left[\left(4x\right)^2-2.4x.1+1^2\right]+4=0\)
\(\Rightarrow\left(4x-1\right)^2+4=0\)
\(\Rightarrow\left(4x-1\right)^2=-4\) vô lí vì\(4x-1\ne4\)
\(\left(a-2b\right)^2-\left(3a+b\right)^2\)
\(\Rightarrow\left(a-2b-3a-b\right)\left(a-2b+3a+b\right)\)
\(\Rightarrow\left(-2a-2b\right)\left(4a-b\right)\)
\(\left(4a+3b\right)^2-\left(b-2a\right)^2\)
\(\Rightarrow\left(4a+3b-b+2a\right)\left(4a+3b+b-2a\right)\)
\(\Rightarrow\left(6a+2b\right)\left(2a+4b\right)\)
\(36\left(x-y\right)-25\left(2x-1\right)^2\)chịu
\(-3x^2+5x=0\)
\(\Rightarrow x\left(-3x+5\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=0\\x=\frac{5}{3}\end{matrix}\right.\)
\(x^2-5x-24=0\)
\(\Rightarrow x^2-3x+8x-24=0\)
\(\Rightarrow x\left(x-3\right)+8\left(x-3\right)=0\)
\(\Rightarrow\left(x-3\right)\left(x+8\right)=0\)
\(\Rightarrow\left[{}\begin{matrix}x=3\\x=-8\end{matrix}\right.\)