Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Lời giải:
a.
$2x(3x^2-4x+2)=2x.3x^2-2x.4x+2x.2$
$=6x^3-8x^2+4x$
b.
$2x(3x+5)-3(2x^2-2x+3)=2x.3x+2x.5-(3.2x^2-3.2x+3.3)$
$=6x^2+10x-6x^2+6x-9=16x-9$
=3x(x^2-2)(3x^2+x-2)
=(3x^3-6x)(3x^2+x-2)
=9x^5+3x^4-6x^3-18x^3-6x^2+12x
=9x^5+3x^4-12x^3-6x^2+12x
2x(x^2-1)=2x^3-2x
\(a,=12x^2+18x-12x^2+x+1=19x+1\\ b,=4x^3y^4-3xy^2-\dfrac{3}{2}x\)
\(\frac{x}{3x+1}+\frac{2x+1}{3x+1}=\frac{x+2x+1}{3x+1}=\frac{3x+1}{3x+1}=1\)
\(\text{CHÚC BẠN HOK TOT}\)
\(\frac{x}{3x+1}+\frac{2x+1}{3x+1}=\frac{x+2x+1}{3x+1}=\frac{\left(x+2x\right)+1}{3x+1}=\frac{3x+1}{3x+1}=1\)
\(=\dfrac{3x+2}{\left(x-1\right)^2}-\dfrac{6}{\left(x-1\right)\left(x+1\right)}+\dfrac{2-3x}{\left(x+1\right)^2}\\ =\dfrac{\left(3x+2\right)\left(x+1\right)^2-6\left(x^2-1\right)+\left(2-3x\right)\left(x-1\right)^2}{\left(x-1\right)^2\left(x+1\right)^2}\\ =\dfrac{10x^2+10}{\left(x-1\right)^2\left(x+1\right)^2}\)
a: =9x^2-12x+4-4x^2+14x
=5x^2+2x+4
b: \(=\dfrac{2+x+1+x-1}{2\left(x-1\right)\left(x+1\right)}=\dfrac{2x+2}{2\left(x-1\right)\left(x+1\right)}=\dfrac{1}{x-1}\)
\(=\dfrac{2x+6}{x\left(3x-1\right)}+\dfrac{x+3}{3x-1}\)
\(=\dfrac{2x+6+x^2+3x}{x\left(3x-1\right)}\)
\(=\dfrac{x^2+5x+6}{x\left(3x-1\right)}\)
\(3x\left(2x+1\right)=6x^2+3x\)