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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: \(=-\left(10x^2+15x-8x-12\right)=-10x^2-7x+12\)
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: \(x\notin\left\{0;1\right\}\)
\(\dfrac{3}{x}-\dfrac{5}{x-1}+\dfrac{3x+2}{x^2-x}\)
\(=\dfrac{3}{x}-\dfrac{5}{x-1}+\dfrac{3x+2}{x\left(x-1\right)}\)
\(=\dfrac{3x-3-5x+3x+2}{x\left(x-1\right)}\)
\(=\dfrac{x-1}{x\left(x-1\right)}=\dfrac{1}{x}\)
\(\dfrac{5x+5y}{3x-3y}:\dfrac{5x}{x^2-y^2}.\)
\(=\dfrac{5\left(x+y\right)}{3\left(x-y\right)}.\dfrac{\left(x-y\right)\left(x+y\right)}{5x}.\)
\(=\dfrac{x+y}{3}.\dfrac{x+y}{x}.\)
\(=\dfrac{\left(x+y\right)^2}{3x}.\)
1. 2x2y(2x2+3x+3)
= 4x4y +6x3y+6x2y
2) ( 4x2y + 6xy2 - 2x )1/2xy2
= 2x3y3 +3x2y4-x2y2
\(=\dfrac{6x^3+3x^2-10x^2-5x+4x+2}{2x+1}=3x^2-5x+2\)