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)
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)
By Delilah
By 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)
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`