\(1.5x^2y^4-10x^4y^2+5x^2y^2=5x^2y^2\left(y^2-2x^2+1\right)\)
\(2.3a\left(x+y\right)-6ab\left(x+y\right)=3a\left(x+y\right)\left(1-2b\right)\)
\(3.2a^2\left(x-y\right)-4a\left(y-x\right)=2a^2\left(x-y\right)+4a\left(x-y\right)=2a\left(x-y\right)\left(a+2\right)\)
\(4.7a\left(x-2y\right)-14a^2\left(2y-x\right)=7a\left(x-2y\right)+14a^2\left(x-2y\right)=7a\left(x-2y\right)\left(2a+1\right)\)
1) 5x2y4 - 10x4y2 + 5x2y2
= 5x2y4 - 5x4y2 - 5x4y2 + 5x2y2
= 5x2y2 ( y2 - x2 ) - 5x2y2 (x2 - 1 )
= 5x2y2 ( y2 - x2 -x2 + 1)
= 5x2y2 ( y2 - 2x2 + 1)
2) 3a ( x+y) - 6ab (x+y)
=(x+y) (3a - 6ab )= 3a (x+y)(1 - 2b )
3) 2a2 ( x-y ) - 4a (y-x)
= 2a2 ( x-y) + 4a ( x -y )
= (x-y) (2a2 - 4a ) = 2a (x-y)(a -2)
4) 7a(x - 2y ) - 14a2 (2y - x)
= 7a (x-2y ) +14a2 ( x-2y )
= (x - 2y ) (7a + 14a2 )
= 7a ( x-2y ) ( 1+2a)