x3+ x2z+ y2z- xy2+ y3
Phân tích đa thức thành nhân tử
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(\left(x^2+y^2-5\right)-\left(2xy-4\right)^2=\left(x^2+y^2-1-2xy\right)^2=\left[\left(x-y\right)^2-1\right]^2=\left(x-y-1\right)^2\left(x-y+1\right)^2\)
(x2+1)2-6(x2+1)2+5
= (x2+1)2(-6+1)+5
= -5(x2+1)2+5
= -5(x4+2x2+1-1)
= -5(x4+2x2)
= -5x4-10x2
Lời giải:
$x^3-6x^2+12x-8=0$
$\Leftrightarrow (x-2)^3=0$
$\Leftrightarrow x-2=0$
$\Leftrightarrow x=2$
\(x^3-6x^2+12x-8=0\)
`<=>x^3-3.x^3.2+3.x.2^2-2^3=0`
`<=>(x-2)^3=0`
`<=>x-2=0`
`<=>x=2`
\(x^3+9x^2+27x+27=0\)
\(\Leftrightarrow x^3+3.x^2.3+3.x.3^2+3^3=0\)
\(\Leftrightarrow\left(x+3\right)^3=0\)
`<=>x+3=0`
`<=>x=-3`
\(x^3+9x^2+27x+27=0\)
\(\Leftrightarrow x^3+3.3.x^2+3.9x+3^3=0\)
\(\Leftrightarrow\left(x+3\right)^3=0\)
\(\Rightarrow x+3=0\Rightarrow x=-3\)
1 Tom didn't fix the refrigerator last monday
2 did her husband put a bunch of flowers on her desk?
3 she wasn't helping her dad at 11 am yesterday
4 were most of them safe after the accident?
5 he wasn't making any hot chocolate at 1:30 this morning
6 was I looking for my watch when the phone rang?
7 were you so scared when we heard a strange sound?
8 Anna didn't eat a lot of pizza at the party last night
9 did the doctor wash her hands after touching the patients?