Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(a,Q=\left(-2x^3y+7x^2y+3xy\right)+P=\left(-2x^3y+7x^2y+3xy\right)+\left(3x^2y-2xy^2-4xy+2\right)\\ =-2x^3y+7x^2y+3xy+3x^2y-3xy^2-4xy+2\\ =-2x^3y^2+10x^2y-3xy^2-xy+2\)
\(b,M=\left(3x^2y^2-5x^2y+8xy\right)-P\\ =\left(3x^2y^2-5x^2y+8xy\right)-\left(3x^2y-2xy^2-4xy+2\right)\\ =3x^2y^2-5x^2y+8xy-3x^2y^2+2xy^2+4xy-2\\ =-3x^2y+12xy-2\)
\(p=\left(x-1\right)\left(x+7\right)\left(x+2\right)\left(x+4\right)+2075\)
\(=\left(x^2+6x-7\right)\left(x^2+6x+8\right)+2075\)
\(=\left(x^2+6x+2-9\right)\left(x^2+6x+2+6\right)+2075\)
\(=\left(x^2+6x+2\right)^2-3\left(x^2+6x+2\right)+2021\)
\(\Rightarrow p\) chia q dư \(2021\)
a: P(x)-Q(x)+H(x)
=x^3-2x^2+3x+1-x^3-x+1+2x^2-1
=2x+1
b: P(x)-Q(x)+H(x)=0
=>2x+1=0
=>x=-1/2
\(P=\left(x-1\right)\left(x+2\right)\left(x+4\right)\left(x+7\right)+2069\)
\(=\left(x-1\right)\left(x+7\right)\left(x+2\right)\left(x+4\right)+2069\)
\(=\left(x^2+6x-7\right)\left(x^2+6x+8\right)+2069\)
\(=\left(x^2+6x+2-9\right)\left(x^2+6x+2+6\right)+2069\)
Mà \(x^2+6x+2=Q\)
\(=>P=\left(Q-9\right)\left(Q+6\right)+2069=Q^2-3Q-54+2069\)
\(=Q^2-3Q+2015=Q\left(Q-3\right)+2015\)
Dễ thấy \(Q\left(Q-3\right)=BS\left(Q\right)\)
\(=>P\)chia Q có số dư là 2015
Vậy................
c) Cách 1:
Để \(P\left(x\right)⋮Q\left(x\right)\)
\(\Leftrightarrow\left(a+3\right)x+b=0\)
\(\Leftrightarrow\hept{\begin{cases}a+3=0\\b=0\end{cases}\Leftrightarrow}\hept{\begin{cases}a=-3\\b=0\end{cases}}\)
Vậy a=-3 và b=0 để \(P\left(x\right)⋮Q\left(x\right)\)
a)
Để \(2n^2-n+2⋮2n+1\)
\(\Leftrightarrow3⋮2n+1\)
\(\Leftrightarrow2n+1\inƯ\left(3\right)=\left\{\pm1;\pm3\right\}\)
\(\Leftrightarrow n\in\left\{0;1;-2;-1\right\}\)
Vậy \(n\in\left\{0;1;-2;-1\right\}\)để \(2n^2-n+2⋮2n+1\)
Q(x).( x - 2 ) + 28 = ( x2 + x + 1 )( x + 2 )
⇔ Q(x).( x - 2 ) = x3 + 3x2 + 3x + 2 - 28
⇔ Q(x).( x - 2 ) = x3 + 3x2 + 3x - 26
⇔ Q(x).( x - 2 ) = x3 - 2x2 + 5x2 - 10x + 13x - 26
⇔ Q(x).( x - 2 ) = x2( x - 2 ) + 5x( x - 2 ) + 13( x - 2 )
⇔ Q(x).( x - 2 ) = ( x - 2 )( x2 + 5x + 13 )
⇔ Q(x) = x2 + 5x + 13