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a: Sửa đề: \(y^2\left(x^2-y^2\right)-xz-yz\)
\(=y^2\left(x-y\right)\left(x+y\right)-z\left(x+y\right)\)
\(=\left(x+y\right)\left(xy^2-y^3-z\right)\)
c: \(25\left(x-y\right)^2-16\left(x+y\right)^2\)
\(=\left(5x-5y\right)^2-\left(4x+4y\right)^2\)
\(=\left(5x-5y-4x-4y\right)\left(5x-5y+4x+4y\right)\)
\(=\left(x-9y\right)\cdot\left(9x-y\right)\)
a) 10x(x-y) - 8y(y-x)
= 10x(x-y) + 8y(x-y)
= (10x-8y)(x-y)
b) x^2 - 2xy + y^2 - 25
=( x- y)^2 - 25
= ( x- y- 5 )( x- y+ 5 )
c) 5x^2 + 10x^2y + 5xy^2
= 5( x^2 + 2x^2y + xy^2)
= 5x ( x + 2xy + y^2)
( 5x^3 hay 5x^2)
a,15x^2-60=15x^2-15*4=15(x^2-4)
b,=(x^2+2xy+y^2)-25=(x+y)^2-5^2=[(x-y)+5][(x-y)-5]
xog 2 phần
a) \(3x^2-6x+9x^2\)
\(=12x^2-6x\)
\(=6x\left(2x-1\right)\)
b) hỏi chấm đề ?
c) \(3x^2+5y-3xy-5x\)
\(=3x\left(x-y\right)-5\left(x-y\right)\)
\(=\left(x-y\right)\left(3x-5\right)\)
d) \(3y^2-3z^2+3x^2-6xy\)
\(=3\left(y^2-z^2+x^2-2xy\right)\)
\(=3\left[\left(x-y\right)^2-z^2\right]\)
\(=3\left(x-y-z\right)\left(x-y+z\right)\)
e) \(16x^3+54y^3\)
\(=2\left(8x^3+27y^3\right)\)
\(=2\left(2x+3y\right)\left(4x^2-6xy+9y^2\right)\)
f) \(x^2-25-2xy+y^2\)
\(=\left(x-y\right)^2-5^2\)
\(=\left(x-y-5\right)\left(x-y+5\right)\)
g) \(x^5-3x^4-3x^3-x^2\)
\(=x^2\left(x^3-3x^2-3x-1\right)\)
Giải:
a) x2 - 2xy + y2 - 25 = (x - y)2 - 52 = (x - y - 5)(x - y + 5)
b) x2 - 10x - y2 + 25 = (x2 - 10x + 25) - y2 = (x - 5)2 - y2 = (x - 5 - y)(x - 5 + y)
c) 3x + 3y + zx + zy = (3x + 3y) + (zx + zy) = 3(x + y) + z(x + y) = (x + y)(3 + z)
d) x2 - 4y2 + 5x +10y = (x2 - 4y2) + (5x +10y) = (x - 2y)(x + 2y) + 5(x + 2y) = (x + 2y)(x - 2y + 5)