Thực hiện phép tính:
(6x^3-7x^2-x+2):(2x+1)
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CÂU 1:thực hiện phép tinh.
2x(3x^2-7x+2)
(x-2)(3x^2+2x+4)
(3x^2y^2+6x^2y^3-12xy)÷3xy
X^2/x-2+4-4x/x-2
\(2x\left(3x^2-7x+2\right)\)
\(=6x^3-14x^2+4x\)
\(\left(x-2\right)\left(3x^2+2x+4\right)\)
\(=3x^3+\left(-4x^2\right)+\left(-8\right)\)
\(\left(3x^2y^2+6x^2y^3-12xy\right)\div3xy\)
\(=xy+2xy-4\)
x^2/x-2+4-4x/x-2 ???
a: \(=-\left(10x^2+15x-8x-12\right)=-10x^2-7x+12\)
Ta có:
\(\left(x-1\right).\left(x+1\right).\left(x+2\right)\)
\(=\left(x^2+x-x-1\right).\left(x+2\right)\)
\(=\left(x^2-1\right).\left(x+2\right)\)
\(=x^3+2x^2-x-2\)
1: ĐKXĐ: \(x\notin\left\{0;3\right\}\)
\(\dfrac{x+3}{x}-\dfrac{x}{x-3}+\dfrac{9}{x^2-3x}\)
\(=\dfrac{x+3}{x}-\dfrac{x}{x-3}+\dfrac{9}{x\left(x-3\right)}\)
\(=\dfrac{\left(x+3\right)\left(x-3\right)-x^2+9}{x\left(x-3\right)}\)
\(=\dfrac{x^2-9-x^2+9}{x\left(x-3\right)}\)
=0
2: ĐKXĐ: \(x\notin\left\{0;1\right\}\)
\(\dfrac{3}{x}-\dfrac{5}{x-1}+\dfrac{3x+2}{x^2-x}\)
\(=\dfrac{3}{x}-\dfrac{5}{x-1}+\dfrac{3x+2}{x\left(x-1\right)}\)
\(=\dfrac{3x-3-5x+3x+2}{x\left(x-1\right)}\)
\(=\dfrac{x-1}{x\left(x-1\right)}=\dfrac{1}{x}\)
\(3^2\cdot5+2^3\cdot10-3^4:3\\ =9\cdot5+8\cdot10-3^4\\ =45+80-27\\ =98\)
\(3^2.5+2^3.10-3^4:3\)
\(=9.5+8.10-3^3\)
\(=45+80-27\)
\(=125-27\)
\(=98\)
\(#WendyDang\)
\(=\dfrac{6x^3+3x^2-10x^2-5x+4x+2}{2x+1}=3x^2-5x+2\)