x(4x - 1)²(2x - 1)= 3/2

<=>(16x² - 8x + 1)( 2x² - x)= 3/2

<=>(16x² - 8x + 1)( 16x² - 8x)= 12

Đặt 16x² - 8x= y, ta có phương trình:

(y + 1) . y= 12

<=>y² + y - 12=0

<=>y² + 4x - 3x - 12=0

<=>y(y + 4) - 3(x + 4)=0

<=>(y + 4)(y - 3)=0

Đến đây tự làm tiếp nha.

x(4x-1)^2(2x+1)=3/2

<=>8x(4x-1)^2(2x-1)=8.3/2

<=>(16x^2-8x+1)(16x^2-8x)=12     (1)

đặt 16x^2-8x=y  ta có

 (y+1)y=12

<=>y^2+y-12=0

<=>y^2-3y+4y-12=0

<=>y(y-3)+4(y-3)=0

<=>(y-3)(y+4)=0

thay y=x^2+8x rồi giải phương trình

#Lười gõ phần sau

x(4x - 1)²(2x - 1)= 3/2

<=>(2x² - x)(16x² - 8x +1)= 3/2

<=>(16x² - 8x)(16x² - 8x + 1)= 12

Đặt 16x² - 8x= y, ta được

y(y+ 1)=12

<=> y² + y - 12=0

<=> y² - 3y + 4y - 12=0

<=> y(y - 3) + 4(y - 3)=0

<=>(y - 3)(y + 4)=0

Đến đây tự làm nha

Nếu chơi lmht thì kb vs mk

Tên nick bạn!

acquythanthanh

Ta có : 

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

\(\Leftrightarrow\)\(4x^2-4x-3x^2+15=x-3-x-4\)

\(\Leftrightarrow\)\(x^2-4x+15=-7\)

\(\Leftrightarrow\)\(\left(x^2-2.x.2+2^2\right)+11=-7\)

\(\Leftrightarrow\)\(\left(x-2\right)^2=-18\)

Mà \(\left(x-2\right)^2\ge0\) \(\left(\forall x\inℝ\right)\)

\(\Rightarrow\)\(x\in\left\{\varnothing\right\}\)

Vậy không có giá trị nào của x thoã mãn đề bài 

Chúc bạn học tốt ~ 

\(\left(4x-5\right)\left(2x+30\right)-4\left(x+2\right)\left(2x-1\right)+\left(10x+7\right)\)

\(=8x^2+110x-150-8x^2-12x+8+10x+7\)

\(=108x-135\)

$(4x-5)(2x+30)-4(x+2)(2x-1)+(10x+7)\\=4x(2x+30)-5(2x+30)-4[x(2x-1)+2(2x-1)]+10x+7\\=8x^2+120x-10x-150-4[2x^2-x+4x-2]+10x+7\\=8x^2+120x-143-4[2x^2+3x-2]\\=8x^2+120x-143-8x^2-12x+8\\=108x-135$

\(1,4x\left(1-x\right)-8=1-\left(4x^2+3\right)\\ \Leftrightarrow4x-4x^2-8=1-4x^2-3\\ \Leftrightarrow4x-4x^2-8-1+4x^2+3=0\\ \Leftrightarrow4x-6=0\\ \Leftrightarrow x=\dfrac{3}{2}\)

\(2,\left(2-3x\right)\left(x+11\right)=\left(3x-2\right)\left(2-5x\right)\\ \Leftrightarrow\left(2-3x\right)\left(x+11\right)-\left(2-3x\right)\left(5x-2\right)=0\\ \Leftrightarrow\left(2-3x\right)\left(x+11-5x+2\right)=0\\ \Leftrightarrow\left(2-3x\right)\left(-4x+13\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=\dfrac{2}{3}\\x=\dfrac{13}{4}\end{matrix}\right.\)

`a)`

`A(x) + B(x) = 2x - 4x^2 + 1 + x^3 - 4x^2 + 5 - 2x`

                  `= x^3 - ( 4x^2 + 4x^2 ) + ( 2x - 2x ) + ( 1+ 5 )`

                  `= x^3 - 8x^2 + 6`

__________________________________________________________

`b)`

    `P(x) + B(x) = A(x)`

`=>P(x) = A(x) - B(x)`

`=>P(x) = 2x - 4x^2 + 1 + x^3 + 4x^2 - 5 + 2x`

`=>P(x) = x^3 + ( -4x^2 + 4x^2 ) + ( 2x + 2x ) + ( 1 - 5 )`

`=>P(x) = x^3 + 4x - 4`

\(ĐKXĐ:x\ne1;5;9\)

\(pt\Leftrightarrow\frac{2x-1}{\left(x-1\right)\left(x-5\right)}+\frac{\left(x-2\right)}{\left(x-1\right)\left(x-9\right)}=\frac{3x-12}{\left(x-9\right)\left(x+5\right)}\)

\(\Rightarrow\left(2x-1\right)\left(x-9\right)+\left(x-2\right)\left(x-9\right)=\left(3x-12\right)\left(x-1\right)\)

\(=>2x^2-x-18x+9+x^2-2x+5x-10=3x^2-12-3x+12\)

\(=>3x^2-16x-1=3x^2-15x+12\)

=>x=-13

\(3\left(4x-5\right)^2-8x+10=0\)

\(\Leftrightarrow\)\(3\left(4x-5\right)\left(4x-5\right)-2\left(4x-5\right)=0\)

\(\Leftrightarrow\)\(\left(4x-5\right)\left[2\left(4x-5\right)-2\right]=0\)

\(\Leftrightarrow\)\(\left(4x-5\right)\left(8x-10-2\right)=0\)

\(\Leftrightarrow\)\(\left(4x-5\right)\left(8x-12\right)=0\)

\(\Leftrightarrow\)\(\orbr{\begin{cases}4x-5=0\\8x-12=0\end{cases}}\)

\(\Leftrightarrow\)\(\orbr{\begin{cases}x=\frac{5}{4}\\x=1,5\end{cases}}\)

Vậy...

k mk đi

ai k mk 

mk k lại 

thanks