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1: =10(a^3-a)
=10a(a^2-1)
=10a(a-1)(a+1)
2: \(=5xy\left(1-8a^3b^3\right)\)
\(=5xy\left(1-2ab\right)\left(1+2ab+4a^2b^2\right)\)
3: \(=5\left(a^2+2ab+b^2\right)=5\left(a+b\right)^2\)
4: \(=6\left(p^2-2p+1\right)=6\left(p-1\right)^2\)
5: =(m+n)^2-p^2
=(m+n-p)(m+n+p)
6: =2(27x^3+8y^3)
=2(3x+2y)(9x^2-6xy+4y^2)
1) 10a³ - 10a
= 10a(a² - 1)
= 10a(a - 1)(a + 1)
2) 5xy - 40a³b³xy
= 5xy(1 - 8a³b³)
= 5xy(1 - 2ab)(1 + 2ab + 4a²b²)
3) 5a² + 10ab + 5b²
= 5(a² + 2ab + b²)
= 5(a + b)²
4) 6p² - 12p + 6
= 6(p² - 2p + 1)
= 6(p - 1)²
5) m² + 2mn + n² - p²
= (m + n)² - p²
= (m + n - p)(m + n + p)
6) 54x³ + 16y³
= 2(27x³ + 8y³)
= 2[(3x)³ + (2y)³]
= 2(3x + 2y)(9x² - 6xy + 4y²)
7) Sửa đề:
1 - m² + 2mn - n²
= 1 - (m² - 2mn + n²)
= 1 - (m - n)²
= (1 + m - n)(1 - m + n)
a: \(5a^2xy-10a^3x-15axy\)
\(=5ax\left(ay-2a^2-3y\right)\)
b: \(\left(3+2x\right)\left(3-2x\right)-\left(2x+1\right)^2\)
\(=9-4x^2-4x^2-4x-1\)
\(=-8x^2-4x+8\)
a) \(3xy^2-12xy+12x\)
\(=3x\left(y-4y+4\right)\)
b) \(3x^3y-6x^2y-3xy^3-6axy^2-3a^2xy+3xy\)
\(=3xy\left(x^2-2x-y^2-2ay-a^2+1\right)\)
\(=3xy\left[\left(x^2-2\cdot x\cdot1+1^2\right)-\left(y^2+2\cdot y\cdot a+a^2\right)\right]\)
\(=3xy\left[\left(x-1\right)^2-\left(y+a\right)^2\right]\)
\(=3xy\left(x-1-y-a\right)\left(x-1+y+a\right)\)
c) \(36-4a^2+20ab-25b^2\)
\(=6^2-\left[\left(2a\right)^2-2\cdot2a\cdot5b+\left(5b\right)^2\right]\)
\(=6^2-\left(2a-5b\right)^2\)
\(=\left(6-2a+5b\right)\left(6+2a-5b\right)\)
d) \(5a^3-10a^2b+5ab^2-10a+10b\)
\(=5a\left(a^2-2ab+b^2\right)-10\left(a-b\right)\)
\(=5a\left(a-b\right)^2-10\left(a-b\right)\)
\(=\left(a-b\right)\left[5a\left(a-b\right)-10\right]\)
\(=5\left(a-b\right)\left[a\left(a-b\right)-2\right]\)
\(=5\left(a-b\right)\left(a^2-ab-2\right)\)
a. 3xy2-12xy+12x
= 3x(y2-4y+4)
= 3x(y-2)2
b. 3x3y-6x2y-3xy3-6axy2-3a2xy+3xy
= 3xy( x2-2x-y2-2ay-a2+1)
= 3xy ((x2-2x+1)-(a2-2ay-y2))
=3xy((x-1)2-(a-y)2)
= 3xy((x-1+a-y)(x-1-(a-y))
=3xy(x-1+a-y)(x-1-a+y)
d. =( 5a(a2-2ab+b2))-(10(a+b))
= 5a(a-b)2-10(a-b)
=5a(a-b)(a-b)-10(a-b)
=(a-b)(5a(a-b)-10)
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