1) 3x²-5x+3xy-5y 2) 2x²-4x+4xy-8y 3) 3x³-6x 4) (x-2).(y-2) 5) 2x(x²-2y) Cần gấp giúp mik ik :33 17/09/2021 Bởi Athena 1) 3x²-5x+3xy-5y 2) 2x²-4x+4xy-8y 3) 3x³-6x 4) (x-2).(y-2) 5) 2x(x²-2y) Cần gấp giúp mik ik :33
\(\eqalign{ & 1)\,\,\,3{x^2} – 5x + 3xy – 5y \cr & = \left( {3{x^2} + 3xy} \right) – \left( {5x + 5y} \right) \cr & = 3x\left( {x + y} \right) – 5\left( {x + y} \right) \cr & = \left( {x + y} \right)\left( {3x – 5} \right) \cr & 2)\,\,2{x^2} – 4x + 4xy – 8y \cr & = 2x\left( {x – 2} \right) + 4y\left( {x – 2} \right) \cr & = 2\left( {x – 2} \right)\left( {x + 2y} \right) \cr & 3)\,\,3{x^3} – 6x \cr & = 3x\left( {{x^2} – 2} \right) \cr & 4)\,\,\left( {x – 2} \right)\left( {y – 2} \right) \cr & 5)\,\,2x\left( {{x^2} – 2y} \right) \cr} \) Bình luận
1) $=x(3x-5)+y(3x-5)$ $=(3x-5)(x+y)$ 2) $=2x(x-2)+4y(x-2)$ $=2(x-2)(x+2y)$ 3) $=3x(x^2-2)$ $=3x(x-\sqrt2)(x+\sqrt2)$ Bình luận
\(\eqalign{
& 1)\,\,\,3{x^2} – 5x + 3xy – 5y \cr
& = \left( {3{x^2} + 3xy} \right) – \left( {5x + 5y} \right) \cr
& = 3x\left( {x + y} \right) – 5\left( {x + y} \right) \cr
& = \left( {x + y} \right)\left( {3x – 5} \right) \cr
& 2)\,\,2{x^2} – 4x + 4xy – 8y \cr
& = 2x\left( {x – 2} \right) + 4y\left( {x – 2} \right) \cr
& = 2\left( {x – 2} \right)\left( {x + 2y} \right) \cr
& 3)\,\,3{x^3} – 6x \cr
& = 3x\left( {{x^2} – 2} \right) \cr
& 4)\,\,\left( {x – 2} \right)\left( {y – 2} \right) \cr
& 5)\,\,2x\left( {{x^2} – 2y} \right) \cr} \)
1) $=x(3x-5)+y(3x-5)$
$=(3x-5)(x+y)$
2) $=2x(x-2)+4y(x-2)$
$=2(x-2)(x+2y)$
3) $=3x(x^2-2)$
$=3x(x-\sqrt2)(x+\sqrt2)$