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a) 27 x 6 y 9 + 27 x 4 y 6 z 4 + 9 x 2 y 3 z 8 + z 12 .
b) x 6 y 9 − 3 x 4 y 3 z 2 + 3 x 2 y 3 z 4 − y 9 z 6 .
c) − 8 125 a 6 b 6 + 12 25 a 4 b 6 c − 6 5 a 2 b 6 c 2 + b 6 c 3 .
d) 8 c 3 d 6 + 48 c d 5 + 96 cd 4 + 64 c 3 d 3 .
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A-B
=3x^2y^3-5x^3y^2-5xy+1-5x^3y^2+2x^2y^3+5xy-2
=5x^2y^3-10x^3y^2-1
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11: \(\dfrac{1}{3}x^2y^2\left(6x+\dfrac{2}{3}x^2-y\right)\)
\(=2x^3y^2+\dfrac{2}{9}x^4y^2-\dfrac{1}{3}x^2y^3\)
12: \(\dfrac{3}{4}x^3y^2\left(4x^2y-x+y^5\right)\)
\(=3x^5y^3-\dfrac{3}{4}x^4y^2+\dfrac{3}{4}x^3y^7\)
13: \(-5x^2y^4\left(3x^2y^3-2x^3y^2-xy\right)\)
\(=-15x^4y^7+10x^5y^6+5x^3y^5\)
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1/2x^3y(2x^4y^3-4xy-6)
=1/2x^3y*2x^4y^3-1/2x^3y*4xy-1/2x^3y*6
=x^7y^4-2x^4y^2-3x^3y
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1/2x^3y(2x^4y^3-4xy-6)
=1/2x^3y*2x^4y^3-1/2x^3y*4xy-1/2x^3y*6
=x^7y^4-2x^4y^2-3x^3y
![](https://rs.olm.vn/images/avt/0.png?1311)
1: \(=-3x^3-21x^2+x\)
2: \(=-15x^4y^7+10x^5y^6+5x^3y^5\)
3: \(=x^7y^4-2x^4y^2-3x^3y\)
5: \(=15x-6x^2\)
6: \(=4x^3-8x^2+10x\)
7: \(=-8x^5y^3+16x^7y^2-12x^3y^4\)
8: \(=x^7y^4-2x^4y^2-3x^3y\)