Question

Giải câu c rõ ràng giúp e vs

Answer 1

5y(y - x) - 15x(y - x) = (5y - 15x)(y - x)

Answer 2

\(5y\left(y-x\right)+15x\left(x-y\right)\)

= \(5y\left(y-x\right)-15x\left(-x+y\right)\)

= \(5y\left(y-x\right)-15x\left(y-x\right)\)

= \(\left(y-x\right)\cdot\left(5y-15x\right)\)

=\(\left(y-x\right)\cdot5\left(y-3x\right)\)

Answer 3

\(5y\left(y-x\right)+15x\left(x-y\right)\)

\(=-5y\left(x-y\right)+15x\left(x-y\right)\)

\(=5\left(x-y\right)\left(3x-y\right)\)