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2xy - ( 3/4xy ) - 1/4xy
=2xy - 3/4xy -1/4xy
= 2xy - ( 3/4xy + 1/4xy )
= 2xy - xy = xy
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`@` `\text {Ans}`
`\downarrow`
`A = `\(3x^2y-4xy+6x^2y+4xy \)
`= (3x^2y + 6x^2y) + (-4xy + 4xy)`
`= 9x^2y + 0`
`= 9x^2y`
`@` `\text {Kaizuu lv uuu}`
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M=P+P-2Q-P+Q=3P-Q
=15x^2y^3-12xy^2+9y+3-5x^2y^3-4xy^3
=10x^2y^3-12xy^2-4xy^3+9y+3
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\(=\frac{2x\left(x-2y\right)}{\left(x+2y\right)^2}:\frac{\left(2y-x\right)\left(2y+x\right)}{\left(x-2y\right)^2}:\frac{5xy\left(x-2y\right)}{\left(x+2y\right)^3}\)
Điều kiện: \(x\ne2y;x\ne-2y;x\ne0;y\ne0\)
\(=\frac{2x\left(x-2y\right)}{\left(x+2y\right)^2}:\frac{\left(2y+x\right)}{\left(x-2y\right)}:\frac{5xy\left(x-2y\right)}{\left(x+2y\right)^3}\)
\(=\frac{2x\left(x-2y\right)}{\left(x+2y\right)^2}\times\frac{x-2y}{x+2y}\times\frac{\left(x+2y\right)^3}{5xy\left(x-2y\right)}=\frac{2\left(x-2y\right)}{5y}\)
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\(A-\left(x^2+y^2-4xy\right)=x^2+4xy+3x^2\)
\(\Leftrightarrow A=x^2+4xy+3x^2+x^2+y^2-4xy\)
\(\Leftrightarrow A=5x^2+y^2\)
\(B+\left(-x^4+x^2-2x^3-\dfrac{1}{3}\right)=3x^2-2x^3+x-\dfrac{2}{3}\)
\(\Leftrightarrow B=3x^2-2x^3+x-\dfrac{2}{3}+x^4-x^2+2x^3+\dfrac{1}{3}\)
\(\Leftrightarrow B=x^4+2x^2+x-\dfrac{1}{3}\)
65 + 4 x y = 56789
4 x y = 56789 - 65
4 x y = 56724
y = 56724 : 4
y = 14181
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