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a: =2x^5-15x^3-x^2-2x^5-x^3=-16x^3-x^2
b: =x^3+3x^2-2x-3x^2-9x+6
=x^3-11x+6
c: \(=\dfrac{4x^3+2x^2-6x^2-3x-2x-1+5}{2x+1}\)
\(=2x^2-3x-1+\dfrac{5}{2x+1}\)
a) \(6x^3\left(\dfrac{1}{3}x^2-\dfrac{5}{2}-\dfrac{1}{6}\right)-2x^5-x^3\)
\(=6x^3\left(\dfrac{1}{3}x^2-\dfrac{16}{6}\right)-2x^5-x^3\)
\(=2x^5-16x^3-2x^5-x^3\)
\(=-17x^3\)
b) \(\left(x+3\right)\left(x^2+3x-2\right)\)
\(=x^3+3x^2-2x+3x^2+9x-6\)
\(=x^3+6x^2+7x-6\)
c) \(\left(4x^3-4x^2-5x+4\right):\left(2x+1\right)\)
\(=2x^2+4x^3-2x-4x^2-\dfrac{5}{2}-5x+\dfrac{2}{x}+4\)
\(=4x^3-2x^2-7x+\dfrac{2}{x}+\dfrac{3}{2}\)
\(3x\left(x^2-5x+\dfrac{1}{3}\right)=3x.x^2+3x.\left(-5x\right)+3x.\dfrac{1}{3}=3x^3-15x^2+x\)
\(\left(x-2\right)\left(5x-1\right)=x.5x+x.\left(-1\right)+\left(-2\right).5x+\left(-2\right)\left(\right)-1=5x^2-x-10x+2=5x^2-11x+2\)
\(5x\left(3x^2-4x+1\right)=5x.3x^2+5x.\left(-4x\right)+5x.1=15x^3-20x^2+5x\)
\(\left(x+3\right)\left(x^2+3x-5\right)=x.x^2+x.3x+x\left(-5\right)+3.x^2+3.3x+3.\left(-5\right)=x^3+3x^2-5x+3x^2+9x-15=x^3+6x^2+4x-15\)
a)\(\left(2x^2-3x\right)\left(5x^2-2x+1\right)\)
\(=2x^2\left(5x^2-2x+1\right)-3x\left(5x^2-2x+1\right)\)
\(=10x^4-4x^3+2x^2-15x^3+6x^2-3x\)
\(=10x^4-19x^3+8x^2-3x\)
a. \(\left(2x^2-3x\right)\left(5x^2-2x+1\right)\)
\(=10x^4-4x^3+2x^2-15x^3+6x^2-3x\)
\(=10x^4-19x^3+8x^2-3x\)
b. \(\left(2x^4-x^3+3x^2\right):\left(\frac{1}{3}x^2\right)\)
\(=\left(2x^4-x^3+3x^2\right).\frac{3}{x^2}\)
\(=0,6x^2-3x+0,9\)
a: \(=\dfrac{x^4-6x^3+12x^2-14x+3}{x^2-4x+1}\)
\(=\dfrac{x^4-4x^3+x^2-2x^3+8x^2-2x+3x^2-12x+3}{x^2-4x+1}\)
\(=x^2-2x+3\)
b: \(=\dfrac{x^5-3x^4+5x^3-x^2+3x-5}{x^2-3x+5}=x^2-1\)
c: \(=\dfrac{2x^4-5x^3+2x^2+2x-1}{x^2-x-1}\)
\(=\dfrac{2x^4-2x^3-2x^2-3x^3+3x^2+3x+x^2-x-1}{x^2-x-1}\)
\(=2x^2-3x+1\)
\(\frac{x^2-3x-x+3}{x-3}=\frac{x\left(x-3\right)-\left(x-3\right)}{x-3}=\frac{\left(x-3\right)\left(x-1\right)}{x-3}=x-1\)( ĐK: \(x\ne3\))
\(\frac{2x^3-5x^2-4x+3}{2x-1}=\frac{\left(2x^3-x^2\right)-\left(4x^2-2x\right)-\left(6x-3\right)}{2x-1}=\frac{x^2\left(2x-1\right)-2x\left(2x-1\right)-3\left(2x-1\right)}{2x-1}=\frac{\left(2x-1\right)\left(x^2-2x-3\right)}{2x-1}=x^2-2x-3\)( ĐK: \(x\ne\frac{1}{2}\))
Tham khảo nhé~
`a)`
`4x^3 * (-6x^3y)`
`= 4*(-6) * (x^3*x^3) * y`
`= -24x^6y`
`b)`
`(-2y)*(-5xy^2)`
`= (-2)*(-5)*x*(y*y^2)`
`= 10xy^3`
`c)`
`(-2a)^3 * (2ab)^2`
`= (-8a^3) * (4a^2b^2)`
`= (-8*4)*(a^3*a^2)*b^2`
`= -32a^5b^2`
a) \(4x^3\cdot\left(-6x^3y\right)\)
\(=\left(4\cdot-6\right)\cdot\left(x^3\cdot x^3\right)\cdot y\)
\(=-24x^6y\)
b) \(\left(-2y\right)\cdot\left(-5xy^2\right)\)
\(=\left(-2\cdot-5\right)\cdot\left(y\cdot y^2\right)\cdot x\)
\(=10xy^3\)
c) \(\left(-2a\right)^3\cdot\left(2ab\right)^2\)
\(=-8a^3\cdot4a^2b^2\)
\(=\left(-8\cdot4\right)\cdot\left(a^3\cdot a^2\right)\cdot b^2\)
\(=-32a^5b^2\)
\(2\left(3+5x\right)^2-3\left(3x-5\right)^2-\left(3+5x\right)\left(5x-3\right)\)
\(=2\left(9+30x+25x^2\right)-3\left(9x^2-30x+25\right)^2-\left(25x^2-9\right)\)
\(=18+60x+50x^2-27x^2+90x-75-25x^2+9\)
\(=-2x^2+150x-48\)
\(=-x^2+75x-24\)