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NQ
10
5 tháng 7 2018
1) a) \(\left(3x-1\right)\left(9x^2+3x+1\right)-4x\left(x-5\right)\)
\(=27x^3+9x^2+3x-9x^2-3x-1-4x^2+20x\)
\(=27x^3+\left(9x^2-9x^2-4x^2\right)+\left(3x-3x+20x\right)+\left(-1\right)\)
\(=27x^3-4x^2+20x-1\)
b)\(\left(7x+2\right)\left(3-4x\right)-\left(x+3\right)\left(x^2-3x+9\right)\)
\(=21x-28x^2+6-8x-x^3+3x^2-9x-3x^2+9x-27\)
\(=\left(21x-8x-9x+9x\right)+\left(-28x^2+3x^2-3x^2\right)\)\(+\left(6-27\right)\)\(+\left(-x^3\right)\)
\(=13x-28x^2-21-x^3\)
c)\(\left(4x+3\right)\left(4x-3\right)-\left(2-x\right)\left(4+2x+x^2\right)\)
\(=16x^2-12x+12x-9-8-4x-2x^2+4x+2x^2+x^3\)
\(=\left(16x^2-2x^2+2x^2\right)+\left(-12x+12x-4x+4x\right)\)\(+\left(-9-8\right)\)\(+x^3\)
\(=16x^2-17+x^3\)
d)\(\left(3x-8\right)\left(-5x+6\right)-\left(4x+1\right)\left(3x-2\right)\)
\(=-15x^2+18x+40x-48-12x^2+8x-3x+2\)
\(=\left(-15x^2-12x^2\right)+\left(18x+40x+8x-3x\right)\)\(+\left(-48+2\right)\)
\(=-27x^2+63x-46\)
e)\(\left(3x-6\right)4x-2x\left(3x+5\right)-4x^2\)
\(=12x^2-24x-6x^2-10x-4x^2\)
\(=\left(12x^2-6x^2-4x^2\right)+\left(-24x-10x\right)\)
\(=2x^2-34x\)
f)\(\left(5x-6\right)\left(6x-5\right)-x\left(3x+10\right)\)
\(=30x^2-25x-36x+30-3x^2-10x\)
\(=\left(30x^2-3x^2\right)+\left(-25x-36x-10x\right)+30\)
\(=27x^2-71x+30\)
5 tháng 7 2018
2) a)\(x\left(x+3\right)-x^2=6\)
\(\Rightarrow x^2+3x-x^2=6\)
\(\Rightarrow\left(x^2-x^2\right)+3x=6\)
\(\Rightarrow3x=6\)
\(\Rightarrow x=2\)
Vậy x=2
b) \(2x\left(x-5\right)+x\left(-2x-1\right)=6\)
\(\Rightarrow2x^2-10x-2x^2-x=6\)
\(\Rightarrow\left(2x^2-2x^2\right)+\left(-10x-x\right)=6\)
\(\Rightarrow-11x=6\)
\(\Rightarrow x=-\dfrac{6}{11}\)
\(\)Vậy \(x=-\dfrac{6}{11}\)
c) x(x+5)-(x+1)(x-2)=7
\(\Rightarrow x^2+5x-x^2+2x-x+2=7\)
\(\Rightarrow\left(x^2-x^2\right)+\left(5x+2x-x\right)=7-2\)
\(\Rightarrow6x=5\)
\(\Rightarrow x=\dfrac{5}{6}\)
Vậy x=\(\dfrac{5}{6}\)
d)\(\left(3x+4\right)\left(6x-3\right)-\left(2x+1\right)\left(9x-2\right)=10\)
\(\Rightarrow18x^2-9x+24x-12-18x^2+4x-9x+2=10\)
\(\Rightarrow\left(18x^2-18x^2\right)+\left(-9x+24x+4x-9x\right)+\left(-12+2\right)=10\)
\(\Rightarrow10x-10=10\)
\(\Rightarrow10x=20\)
\(\Rightarrow x=2\)
Vậy x=2
NT
1
23 tháng 12 2019
\(\frac{1}{3x-2}-\frac{4}{3x+2}-\frac{3x-6}{4-9x^2}\left(đk:x\ne\pm\frac{2}{3};\right)\)\(=\frac{3x+2}{\left(3x-2\right)\left(3x+2\right)}-\frac{4\left(3x-2\right)}{\left(3x-2\right)\left(3x+2\right)}+\frac{3x-6}{\left(3x-2\right)\left(3x+2\right)}\)
=\(\frac{10-9x}{\left(3x-2\right)\left(3x+2\right)}+\frac{3x-6}{\left(3x-2\right)\left(3x+2\right)}=\frac{4-6x}{\left(3x-2\right)\left(3x+2\right)}\)
\(=\frac{-2\left(3x-2\right)}{\left(3x-2\right)\left(3x+2\right)}=\frac{-2}{3x+2}\)
23 tháng 7 2022
a: \(\Leftrightarrow\left(3x+1\right)^2-2\left(3x+1\right)\left(3x+5\right)+\left(3x+5\right)^2=4\)
\(\Leftrightarrow\left(3x+1-3x-5\right)^2=4\)
=>16=4(vô lý)
c: \(\Leftrightarrow6x^2+27x+4x+18-6x^2-x-12x-2=x+1-x+6=7\)
=>18x+16=7
=>18x=-9
hay x=-1/2
28 tháng 8 2017
\(\left(1-3x\right)^2-\left(x-2\right)\left(9x+1\right)=\left(3x-4\right)\left(3x+4\right)-9\left(x+3\right)^2\)
\(\Leftrightarrow1-6x+9x^2-\left[x\left(9x+1\right)-2\left(9x+1\right)\right]=9x^2-16-9\left(x^2+6x+9\right)\)\(\Leftrightarrow1-6x+9x^2-\left(9x^2+x-18x-2\right)=9x^2-16-9x^2-54x-81\)\(\Leftrightarrow1-6x+9x^2-9x^2+x-18x-2=9x^2-16x-9x^2-54x-81\)\(\Leftrightarrow-1-24x=70x-81\)
\(\Leftrightarrow-1-24x-70x+81=0\)
\(\Leftrightarrow80-94x=0\)
\(\Leftrightarrow94x=80\Leftrightarrow x=\dfrac{40}{47}\)
a) ĐKXĐ : \(\left\{{}\begin{matrix}3x-2\ne0\\3x+2\ne0\\4-9x^2\ne0\end{matrix}\right.\Leftrightarrow x\ne\pm\dfrac{2}{3}\)
\(C=\dfrac{1}{3x-2}-\dfrac{4}{3x+2}-\dfrac{3x-6}{4-9x^2}\)
\(=\dfrac{3x+2}{\left(3x-2\right)\left(3x+2\right)}-\dfrac{4.\left(3x-2\right)}{\left(3x-2\right)\left(3x+2\right)}+\dfrac{3x-6}{9x^2-4}\)
\(=\dfrac{3x+2-4.\left(3x-2\right)+3x-6}{\left(3x-2\right).\left(3x+2\right)}=\dfrac{-6x+4}{\left(3x-2\right).\left(3x+2\right)}\)
\(=\dfrac{-2}{3x+2}\)
b) Với \(x\inℤ\)
Ta có : \(C\inℤ\Leftrightarrow-2⋮3x+2\)
\(\Leftrightarrow3x+2\inƯ\left(-2\right)\)
\(\Leftrightarrow3x+2\in\left\{1;2;-1;-2\right\}\)
Lập bảng
Vậy \(x\in\left\{0;-1\right\}\)
Ta có :
Lập bảng
Vậy