phân tích a)3a+3b-ab-a^2 b)x^2-7x+6 c)3x^2+3x d)25x^2+3x e)x(x-2)(x+2)-y(x-2) 21/11/2021 Bởi Delilah phân tích a)3a+3b-ab-a^2 b)x^2-7x+6 c)3x^2+3x d)25x^2+3x e)x(x-2)(x+2)-y(x-2)
Đáp án: Giải thích các bước giải: a)3a+3b – ab – a² =3(a + b) – a(b + a) =3(a + b) – a(a + b) =(3 – a)(a + b) b)x² – 7x + 6 =x² – x – 6x + 6 =x(x – 1) – 6(x – 1) =(x – 6)(x – 1) c)3x² + 3x =3x(x + 1) d)25x² + 3x =x.(25x + 3) e)x(x – 2)(x + 2) – y(x – 2) =(x – 2)(x² + 2x) – y(x – 2) =(x – 2)(x² + 2x – y) Bình luận
Đáp án: `a)=(a+b)(3-a)` `b)=(x-1)(x-6)` `c)=3x(x+1)` `d)=x(25x+3)` `e)=(x-2)(x^2+2x-y)` Giải thích các bước giải: `a)3a+3b-ab-a^2` `=3(a+b)-a(b+a)` `=(a+b)(3-a)` `b)x^2-7x+6` `=x^2-6x-x+6` `=x(x-6)-(x-6)` `=(x-1)(x-6)` `c)3x^2+3x` `=3x(x+1)` `d)25x^2+3x` `=x(25x+3)` `e)x(x-2)(x+2)-y(x-2)` `=(x^2+2x)(x-2)-y(x-2)` `=(x-2)(x^2+2x-y)` `Huyy` Bình luận
Đáp án:
Giải thích các bước giải:
a)3a+3b – ab – a²
=3(a + b) – a(b + a)
=3(a + b) – a(a + b)
=(3 – a)(a + b)
b)x² – 7x + 6
=x² – x – 6x + 6
=x(x – 1) – 6(x – 1)
=(x – 6)(x – 1)
c)3x² + 3x
=3x(x + 1)
d)25x² + 3x
=x.(25x + 3)
e)x(x – 2)(x + 2) – y(x – 2)
=(x – 2)(x² + 2x) – y(x – 2)
=(x – 2)(x² + 2x – y)
Đáp án:
`a)=(a+b)(3-a)`
`b)=(x-1)(x-6)`
`c)=3x(x+1)`
`d)=x(25x+3)`
`e)=(x-2)(x^2+2x-y)`
Giải thích các bước giải:
`a)3a+3b-ab-a^2`
`=3(a+b)-a(b+a)`
`=(a+b)(3-a)`
`b)x^2-7x+6`
`=x^2-6x-x+6`
`=x(x-6)-(x-6)`
`=(x-1)(x-6)`
`c)3x^2+3x`
`=3x(x+1)`
`d)25x^2+3x`
`=x(25x+3)`
`e)x(x-2)(x+2)-y(x-2)`
`=(x^2+2x)(x-2)-y(x-2)`
`=(x-2)(x^2+2x-y)`
`Huyy`