\(a=\lim\limits_{x\rightarrow2}\frac{4\left(x-2\right)}{\left(x-2\right)\left(\sqrt[3]{16x^2}+2\sqrt[3]{4x}+4\right)}=\lim\limits_{x\rightarrow2}\frac{4}{\sqrt[3]{16x^2}+2\sqrt[3]{4x}+4}=\frac{4}{12}=\frac{1}{3}\)

\(b=\lim\limits_{x\rightarrow3}\frac{27-x^3}{4\left(x-3\right)}.\frac{\sqrt{4x-3}+3}{4-2\sqrt[3]{19-x^3}+\sqrt[3]{\left(19-x^3\right)^2}}\)

\(=\lim\limits_{x\rightarrow3}\frac{-\left(9+3x+x^2\right)\left(\sqrt{4x-3}+3\right)}{4\left(4-2\sqrt[3]{19-x^3}+\sqrt[3]{\left(19-x^3\right)^2}\right)}=-\frac{27}{8}\)

\(a,\)

\(A=\left(\frac{4x}{x+2}-\frac{x^3-8}{x^3+8}.\frac{4x^2-4x+16}{x^2-4}\right):\frac{16}{x+2}.\frac{x^2+3x+2}{x^2+x+1}\)\(ĐKXĐ:x\ne\pm2\)

\(A=[\frac{4x}{x+2}-\frac{\left(x-2\right)\left(x^2+2x+4\right).4\left(x^2-2x+4\right)}{\left(x+2\right)\left(x^2-2x+4\right)\left(x-2\right)\left(x+2\right)}]:\frac{16}{x+2}.\frac{\left(x+1\right)\left(x+2\right)}{x^2+x+1}\)

\(A=[\frac{4x}{x+2}-\frac{4\left(x^2+2x+4\right)}{\left(x+2\right)^2}].\frac{x+2}{16}.\frac{\left(x+1\right)\left(x+2\right)}{x^2+x+1}\)

\(A=\frac{4x^2+8x-4x^2-8x-16}{\left(x+2\right)^2}.\frac{x+2}{16}.\frac{\left(x+1\right)\left(x+2\right)}{x^2+x+1}\)

\(A=\frac{16\left(x+2\right)}{\left(x+2\right)^2.16}.\frac{\left(x+1\right)\left(x+2\right)}{x^2+x+1}\)

\(A=\frac{-\left(x+1\right)}{x^2+x+1}\)

\(B=\frac{x^2+x-2}{x^3-1}\)\(ĐKXĐ:x\ne1\)

\(B=\frac{\left(x+2\right)\left(x-1\right)}{\left(x-1\right)\left(x^2+x+1\right)}\)

\(B=\frac{x+2}{x^2+x+1}\)

\(b,\)

Ta có:

\(A+B=\frac{-\left(x+1\right)}{x^2+x+1}+\frac{x+2}{x^2+x+1}\)

\(=\frac{-x-1+x+2}{x^2+x+1}\)

\(=\frac{1}{x^2+x+1}\)

\(\Rightarrow A+B=\frac{1}{x^2+x+1}=\frac{1}{x^2+2.x.\left(\frac{1}{2}\right)^2+\frac{3}{4}}=\frac{1}{\left(x+\frac{1}{2}\right)^2}+\frac{3}{4}\)

Vì:\(\left(x+\frac{1}{2}\right)^2\ge0\forall x\)

\(\Rightarrow\left(x+\frac{1}{2}\right)^2+\frac{3}{4}\ge\frac{3}{4}\forall x\)

\(\Rightarrow\frac{1}{\left(x+\frac{1}{2}\right)^2+\frac{3}{4}}\le\frac{1}{\frac{3}{4}}\)

\(\Rightarrow A+B\le\frac{4}{3}\)

\(\Rightarrow GTLN\)của \(A+B=\frac{4}{3}\Leftrightarrow x+\frac{1}{2}=0\)

                                                        \(\Leftrightarrow x=\frac{-1}{2}\left(TMĐK\right)\)

Vậy........

-guể viết lại làm gì man?

a) Để \(\frac{15}{4x^2-12x+19}\le\frac{3}{2}\) thì \(15\cdot2\le3\cdot\left(4x^2-12x+19\right)\)

\(\Leftrightarrow30\le12x^2-36x+57\)

\(\Leftrightarrow30-12x^2+36x-57\le0\)

\(\Leftrightarrow-12x^2+36x-27\le0\)

\(\Leftrightarrow-12\left(x^2-3x+\frac{9}{4}\right)\le0\)

\(\Leftrightarrow-12\left(x-\frac{3}{2}\right)^2\le0\)(luôn đúng)

b) Để \(\frac{4x+3}{x^2+1}\le4\)

thì \(4x+3\le4\left(x^2+1\right)\)

\(\Leftrightarrow4x+3\le4x^2+4\)

\(\Leftrightarrow4x+3-4x^2-4\le0\)

\(\Leftrightarrow-4x^2+4x-1\le0\)

\(\Leftrightarrow-\left(4x^2-4x+1\right)\le0\)

\(\Leftrightarrow-\left(2x-1\right)^2\le0\)(luôn đúng)

\(\frac{a}{x-2}+\frac{b}{\left(x+1\right)^2}=\frac{a\left(x+1\right)^2+b\left(x-2\right)}{\left(x-2\right)\left(x+1\right)^2}=\frac{ax^2+\left(2a+b\right)x+\left(a-2b\right)}{x^3-3x-2}\)

\(\Rightarrow\frac{x^2+5}{x^3-3x-2}=\frac{ax^2+\left(2a+b\right)x+\left(a-2b\right)}{x^3-3x-2}\)

Đồng nhất hệ số, ta có :

\(\hept{\begin{cases}a=1\\2a+b=0\\a-2b=5\end{cases}\Rightarrow\hept{\begin{cases}a=1\\b=-2\end{cases}}}\)

cái thứ 2 tương tự

a)  \(\left(2x+1\right)\left(3x-2\right)=\left(2x+1\right)\left(5x-8\right)\)

\(\Leftrightarrow\)\(\left(2x+1\right)\left(3x-2\right)-\left(2x+1\right)\left(5x-8\right)=0\)

\(\Leftrightarrow\)\(\left(2x+1\right)\left(3x-2-5x+8\right)=0\)

\(\Leftrightarrow\)\(\left(2x+1\right)\left(6-2x\right)=0\)

\(\Leftrightarrow\)\(\orbr{\begin{cases}2x+1=0\\6-2x=0\end{cases}}\)

\(\Leftrightarrow\)\(\orbr{\begin{cases}x=-0,5\\x=3\end{cases}}\)

Vậy...

b)   \(ĐKXĐ:\)  \(x\ne-2;\) \(x\ne4\)

          \(\frac{3}{x+2}+\frac{2}{x-4}=0\)

\(\Leftrightarrow\)\(\frac{3\left(x-4\right)}{\left(x+2\right)\left(x-4\right)}+\frac{2\left(x+2\right)}{\left(x+2\right)\left(x-4\right)}=0\)

\(\Leftrightarrow\)\(\frac{3x-12+2x+4}{\left(x+2\right)\left(x-4\right)}=0\)

\(\Leftrightarrow\)\(\frac{5x-8}{\left(x+2\right)\left(x-4\right)}=0\)

\(\Rightarrow\)\(5x-8=0\)

\(\Leftrightarrow\)\(x=\frac{8}{5}\) (T/m đkxđ)

Vậy...

c)  \(x^3+4x^2+4x+3=0\)

\(\Leftrightarrow\)\(x^3+3x^2+x^2+3x+x+3=0\)

\(\Leftrightarrow\)\(x^2\left(x+3\right)+x\left(x+3\right)+\left(x+3\right)=0\)

\(\Leftrightarrow\)\(\left(x+3\right)\left(x^2+x+1\right)=0\)

\(\Leftrightarrow\)\(x+3=0\)  (do  \(x^2+x+1=\left(x+\frac{1}{2}\right)^2+\frac{3}{4}>0\) \(\forall x\))

\(\Leftrightarrow\)\(x=-3\)

Vậy...

có thể làm giùm 3 câu còn lại ko bn:)