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`#3107.101107`
`5x^2y(3x^3 - 4y + 5xy) - 15x^5y + 20x^2y^2`
`= 15x^5y - 20x^2y^2 + 25x^3y^2 - 15x^5y + 20x^2y^2`
`= (15x^5y - 15x^5y) + (-20x^2y^2 + 20x^2y^2) + 25x^3y^2`
`= 25x^3y^2`
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`(8x^5y^2 + 4x^3y^3 - 2x^6y^2) \div 2x^3y`
`= 4x^2y + 2y^2 - x^3y`
a) \(2xy\left(3x^2-5xy+4y^2\right)=6x^3y-10x^2y^2+8xy^3\)
b) \(\left(x-3\right)^2+\left(x+5\right)\left(5-x\right)=x^2-6x+9+25-x^2=34-6x\)
a: \(2xy\left(3x^2-5xy+4y^2\right)=6x^3y-10x^2y^2+8xy^3\)
b: \(\left(x-3\right)^2+\left(x+5\right)\left(5-x\right)\)
\(=x^2-6x+9+25-x^2\)
=-6x+34
a:\(2x^2y\left(3x^2-5xy+4y^2\right)-6x^4y-10x^3y^2+8x^2y^3\)
b: \(\left(x^2-9\right)^2-\left(x+3\right)\left(x-3\right)\left(x^2+9\right)\)
\(=x^4-18x^2+81-\left(x^4-81\right)\)
\(=-18x^2+162\)
a) 2x.(3x2 – 5x + 3)
=2x3-10x2+6x
b(-2x-1).( x2 + 5x – 3 ) – (x-1)3
=-2x3 - 10x2 + 6x - x2 - 5x + 3 - x3 + 3x2 - 3x + 1
= -3x3 - 8x2 - 2x + 4
d) (6x5y2 – 9x4y3 + 15x3y4) : 3x3y2
=2x2-3xy+5y2
1) \(\left(x^3-8\right):\left(x-2\right)=\left[\left(x-2\right)\left(x^2+2x+4\right)\right]:\left(x-2\right)=x^2+2x+4\)
2) \(\left(x^3-1\right):\left(x^2+x+1\right)=\left[\left(x-1\right)\left(x^2+x+1\right)\right]:\left(x^2+x+1\right)=x-1\)
3) \(\left(x^3+3x^2+3x+1\right):\left(x^2+2x+1\right)=\left(x+1\right)^3:\left(x+1\right)^2=x+1\)
4) \(\left(25x^2-4y^2\right):\left(5x-2y\right)=\left[\left(5x-2y\right)\left(5x+2y\right)\right]:\left(5x-2y\right)=5x+2y\)
a: \(-2y\left(5xy+3x^2\right)=-10xy^2-6x^2y\)
b: \(\left(2x+y\right)\left(4x-y\right)\)
\(=8x^2-2xy+4xy-y^2\)
\(=8x^2+2xy-y^2\)
xíu mk làm cho
lâu thế bạn