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=(5a2+5b2+10ab)-5c2=5.(a2+2ab+b2)-5c2=5.(a+b)2-5c2=5.[(a+b)2-c2]=5.(a+b+c).(a+b-c)
=(5a2+5b2+10ab)-5c2=5.(a2+2ab+b2)-5c2=5.(a+b)2-5c2=5.[(a+b)2-c2]=5.(a+b+c).(a+b-c)
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)
b) 2(x-y)^2-x+y = \(2\left(x-y\right)^2-\left(x-y\right)=\left(2x-2y-1\right)\left(x-y\right)\)
1) Ta có: \(3x^2-6xy+3y^2-3z^2\)
\(=3\left(x^2-2xy+y^2-z^2\right)\)
\(=3\left[\left(x^2-2xy+y^2\right)-z^2\right]\)
\(=3\left[\left(x-y\right)^2-z^2\right]\)
\(=3\left(x-y-z\right)\left(x-y+z\right)\)
2) Ta có: \(5a^2+10ab+5b^2-5c^2\)
\(=5\left(a^2+2ab+b^2-c^2\right)\)
\(=5\left[\left(a^2+2ab+b^2\right)-c^2\right]\)
\(=5\left[\left(a+b\right)^2-c^2\right]\)
\(=5\left(a+b-c\right)\left(a+b+c\right)\)
a) \(\left(4n^2-6nm+9m^2\right)\left(2n+3m\right)\)
\(=\left(2n+3m\right)\left[\left(2n\right)^2-2n.3m+\left(3m\right)^2\right]\)
\(=\left(2n\right)^3+\left(3m\right)^3\)
\(=8n^3+27m^3\)
b) Sửa đề \(\left(7+2b\right)\left(4b^2-14b+49\right)\)
\(=\left(7+2b\right)\left[\left(2b\right)^2-2b.7+7^2\right]\)
\(=7^3+\left(2b\right)^3\)
\(=343+8b^3\)
c) \(\left(25a^2+10ab+4b^2\right)\left(5a-2b\right)\)
\(=\left(5a-2b\right)\left[\left(5a\right)^2+5a.2b+\left(2b\right)^2\right]\)
\(=\left(5a\right)^3-\left(2b\right)^3\)
\(=125a^3-8b^3\)
d) \(\left(x^2+x+2\right)\left(x^2-x-2\right)\)
\(=\left[x^2+\left(x+2\right)\right]\left[x^2-\left(x+2\right)\right]\)
\(=x^4-\left(x+2\right)^2\)
5a2 + 5b2 - 10ab - 20d2
= 5 ( a2 + b2 - 2ab - 4d2 )
= 5 [( a2 - 2ab + b2 ) - ( 2d )2 ]
= 5 [( a - b )2 - ( 2d )2]
= 5 ( a - b - 2d ) ( a - b + 2d )
\(5a^2+5b^2-10ab-20d^2\)
\(=5\left(a^2+b^2-2ab-4d^2\right)\)
\(=5\left[\left(a-b\right)^2-4d^2\right]\)
\(=5\left(a-b+2d\right)\left(a-b-2d\right)\)