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1,\(=4x\left(x-\dfrac{3}{2}\right)\)
2,\(=-7y^3\left[2x^2y\left(2y+x\right)+3\right]\)
3, = 4x(a-b)-6xy(a-b)
=2x(a-b)(2-3y)
4,
=3(2x+1)-(2x-5)(2x+1)
=(3-2x+5)(2x+1)
=(8-2x)(2x+1)
=2(4-x)(2x+1)
\(1,\\ a,=x^3-5x\\ b,=3x^3y-6x^3y^2+9xy\\ c,=6x^2-6x-36\\ d,=x^3+2x^2y-3xy^2\\ 2,\\ a,=4x^2-25\\ b,=x^2-6x+9\\ c,=9x^2+24x+16\\ d,=x^3-6x^2y+12xy^2-8y^3\\ e,=125x^3+225x^2y+135xy^2+27y^3\\ f,=125-x^3\)
\(g,=8y^3+x^3\\ 3,\\ a,=x\left(x+2\right)\\ b,=\left(x-3\right)^2\\ c,=\left(x-y\right)\left(y+5\right)\\ d,=2x\left(y+1\right)-y\left(y+1\right)=\left(2x-y\right)\left(y+1\right)\\ e,=6x^2y^2\left(xy^2+2y-3x\right)\)
a ) \(\frac{4x+3}{x^2-5},A=12x2+9x\)
Suy ra \(\frac{4x+3}{x^2-5}=\frac{\left(4x+3\right).3x}{\left(x^2-5\right).3x}=\frac{12x^2+9x}{3x^3-15x}\)
Chúc bạn học tốt !!!
`a^2 + ab + 2a + 2b = a(a+2) + b(a+2) = (a+b)(a+2)`
p) \(x^3-3x^2+3x-1+2\left(x^2-x\right)\\ =\left(x^3-1\right)-\left(3x^2-3x\right)+2x\left(x-1\right)\\ =\left(x-1\right)\left(x^2+x+1\right)-3x\left(x-1\right)+2x\left(x-1\right)\\ =\left(x-1\right)\left(x^2+x+1-3x+2x\right)\\ =\left(x-1\right)\left(x^2+1\right)\)
p:Ta có: \(x^3-3x^2+3x-1+2\left(x^2-x\right)\)
\(=\left(x-1\right)^3+2x\left(x-1\right)\)
\(=\left(x-1\right)\left(x^2-2x+1+2x\right)\)
\(=\left(x-1\right)\left(x^2+1\right)\)
a) \(\frac{4x+3}{x^2-5}=\frac{\left(4x+3\right).3x}{\left(x^2-5\right).3x}=\frac{12x^2+9x}{3x\left(x^2-5\right)}\)
b) \(\frac{8x^2-8x+2}{\left(4x-2\right)\left(15x-1\right)}=\frac{2\left(4x^2-4x+1\right)}{2\left(2x-1\right)\left(15x-1\right)}=\frac{\left(2x-1\right)^2}{\left(2x-1\right)\left(15x-1\right)}=\frac{2x-1}{15x-1}\)