Phaân tích caùc ña thöùcsau thaønh nhaân töû a)3xy2–6x2y b)3x –3y + x2–y2 c) x2+3x+2 06/08/2021 Bởi Reagan Phaân tích caùc ña thöùcsau thaønh nhaân töû a)3xy2–6x2y b)3x –3y + x2–y2 c) x2+3x+2
Giải thích các bước giải: `a, 3xy^2–6x^2y=3xy( y –2x) ` `b, 3x –3y + x^2–y^2` `= 3 ( x-y ) + ( x-y ) ( x+ y )` `=(x –y)(3 + x + y) ` `c, x^2 + 3x + 2` `= x^2+ x + 2x +2 ` `= ( x^2 + x ) + ( 2x +2 )` `= x ( x+ 1 ) + 2 ( x+ 1 ) ` `= (x+1)(x+2)` Bình luận
`a,3xy^2-6x^2y` `=3xy(y-2x)` `b,3x-3y+x^2-y^2` `=3(x-y)+(x-y)(x+y)` `=(x-y)(3+x+y)` `c,x^2+3x+2` `=x^2+x+2x+2` `=x(x+1)+2(x+1)` `=(x+1)(x+2)` Bình luận
Giải thích các bước giải:
`a, 3xy^2–6x^2y=3xy( y –2x) `
`b, 3x –3y + x^2–y^2`
`= 3 ( x-y ) + ( x-y ) ( x+ y )`
`=(x –y)(3 + x + y) `
`c, x^2 + 3x + 2`
`= x^2+ x + 2x +2 `
`= ( x^2 + x ) + ( 2x +2 )`
`= x ( x+ 1 ) + 2 ( x+ 1 ) `
`= (x+1)(x+2)`
`a,3xy^2-6x^2y`
`=3xy(y-2x)`
`b,3x-3y+x^2-y^2`
`=3(x-y)+(x-y)(x+y)`
`=(x-y)(3+x+y)`
`c,x^2+3x+2`
`=x^2+x+2x+2`
`=x(x+1)+2(x+1)`
`=(x+1)(x+2)`