Toán a,3x×(2x+7y-xy) b,(4x+5y-x)×(3x-2x+6y) Giải giúp em với 28/11/2021 By Valerie a,3x×(2x+7y-xy) b,(4x+5y-x)×(3x-2x+6y) Giải giúp em với
`a,3x×(2x+7y-xy)` `= 6x^2+21xy-3x^2y` `b,(4x+5y-x)×(3x-2x+6y)` `=(3x+5y) × ( x+6y)` `= 3x^2+18xy + 5xy + 30y^3` `= 3x^2 + 30y^2+23xy` Trả lời
$a)3 x × ( 2 x + 7 y − x y ) = 6 x^2 + 21 x y − 3 x^2 y$ $b) ( 4 x + 5 y − x ) × ( 3 x − 2 x + 6 y )$ $= ( 3 x + 5 y ) × ( x + 6 y )$ $= 3 x^2 + 18 x y + 5 x y + 30 y^3$ $= 3 x^2 + 30 y^2 + 23 x y$ Trả lời
`a,3x×(2x+7y-xy)`
`= 6x^2+21xy-3x^2y`
`b,(4x+5y-x)×(3x-2x+6y)`
`=(3x+5y) × ( x+6y)`
`= 3x^2+18xy + 5xy + 30y^3`
`= 3x^2 + 30y^2+23xy`
$a)3 x × ( 2 x + 7 y − x y ) = 6 x^2 + 21 x y − 3 x^2 y$
$b) ( 4 x + 5 y − x ) × ( 3 x − 2 x + 6 y )$
$= ( 3 x + 5 y ) × ( x + 6 y )$
$= 3 x^2 + 18 x y + 5 x y + 30 y^3$
$= 3 x^2 + 30 y^2 + 23 x y$