Tìm đa thức M biết
M + ( 5x^2 - 2xy ) = - 4x^2 + 6xy - y^2
(24 xy^2 - 13x^2y + 2x^2) - M = 10xy^2 + 2x^2 + 3
Giải chi tiết giùm mình nha
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a) <M = -4x^2 + 6xy - y^2 - (5x^2 - 2xy)
= -4x^2 + 6xy - y^2 - 5x^2 + 2xy
= -9x^2 +8xy - y^2
b) M = (24xy^2 - 13x^2y -+2x^3 ) - (10xy^2 + 2x^2 + 3 )
= 24xy^2 - 13x^2y + 2x^3 - 10xy^2 - 2x^2 - 3
= 14xy^2 - 13x^2y + 2x^3 - 2x^2-3
M = 5xy^2 - 3x^2y + 4 + 3xy(x+y)
= 5xy^2 - 3x^2y + 4 + 3x^2y + 3xy^2
= 8xy^2 + 4
M = -6xy^2 ( x^2y - 1/2xy) - 3xy( x^2 y^2 + xy )
= -6x^3y^3 + 3 x^2y^3 - 3x^3y^3 - 3x^2y^2
= -9x^3y^3 + 3x^2y^3 - 3x^2y^2
a) M - 3xy(x+y) = 5xy2 - 3x2y + 4
<=> M - ( 3x2y + 3xy2 ) = 5xy2 - 3x2y + 4
<=> M = 5xy2 - 3x2y + 4 + 3x2y + 3xy2
<=> M = 8xy2 + 4
b) -6xy2 ( x2y - 1/2xy ) - M = 3xy(x2y2 + xy)
<=> -6x3y3 + 3x2y3 - M = 3x3y3 + 3x2y2
<=> M = ( -6x3y3 + 3x2y3 ) - ( 3x3y3 + 3x2y2 )
<=> M = -6x3y3 + 3x2y3 - 3x3y3 - 3x2y2
<=> M = -9x3y3 + 3x2y3 - 3x2y2
a) Ta có: \(M=x^2y+xy^2-5x^2y^2+x^3-2x^2y+6xy^2\)
\(=\left(x^2y-2x^2y\right)+\left(xy^2+6xy^2\right)-5x^2y^2+x^3\)
\(=x^3-x^2y+7xy^2-5x^2y^2\)
Bậc là 4
Ta có: \(N=3x^3+xy+y^2-x^2y^2-2-2xy+7y^2\)
\(=3x^3+\left(xy-2xy\right)+\left(y^2+7y^2\right)-x^2y^2-2\)
\(=3x^2+8y^2-xy-x^2y^2-2\)
Bậc là 4
\(1,=\left(x-2\right)\left(5-y\right)\\ 2,=2\left(x-y\right)^2-z\left(x-y\right)=\left(x-y\right)\left(2x-2y-z\right)\\ 3,=5xy\left(x-2y\right)\\ 4,=3\left(x^2-2xy+y^2-4z^2\right)=3\left[\left(x-y\right)^2-4z^2\right]\\ =3\left(x-y-2z\right)\left(x-y+2z\right)\\ 5,=\left(x+2y\right)^2-16=\left(x+2y-4\right)\left(x+2y+4\right)\\ 6,=-\left(6x^2-3x-4x+2\right)=-\left(2x-1\right)\left(3x-2\right)\\ 7,=\left(2x+y\right)\left(2x+y+x\right)=\left(2x+y\right)\left(3x+y\right)\\ 8,=\left(x-y\right)\left(x+5\right)\\ 9,=\left(x+1\right)^2-y^2=\left(x-y+1\right)\left(x+y+1\right)\\ 10,=\left(x^2-9\right)x=x\left(x-3\right)\left(x+3\right)\\ 11,=\left(x-2\right)\left(y+1\right)\\ 12,=\left(x-3\right)\left(x^2-4\right)=\left(x-3\right)\left(x-2\right)\left(x+2\right)\\ 13,=3\left(x+y\right)-\left(x+y\right)^2=\left(x+y\right)\left(3-x-y\right)\)
a: \(=\dfrac{2xy\left(2x^2y-4x+5\right)}{2xy}=2x^2y-4x+5\)
b: \(=\dfrac{x^2y\left(7x^2y-2y-5x^2y^3\right)}{3x^2y}=\dfrac{7}{3}x^2y-\dfrac{2}{3}y-\dfrac{5}{3}x^2y^3\)
a: 2x^2y-50xy=2xy(x-25)
b: 5x^2-10x=5x(x-2)
c: 5x^3-5x=5x(x^2-1)=5x(x-1)(x+1)
d: \(x^2-xy+x=x\left(x-y+1\right)\)
e: x(x-y)-2(y-x)
=x(x-y)+2(x-y)
=(x-y)(x+2)
f: 4x^2-4xy-8y^2
=4(x^2-xy-2y^2)
=4(x^2-2xy+xy-2y^2)
=4[x(x-2y)+y(x-2y)]
=4(x-2y)(x+y)
f1: x^2ỹ-y^2+y
=(x-y)(x+y)+(x+y)
=(x+y)(x-y+1)
1)
a) => 16x2 - 8x + 1 - 8(2x2 + 3x - 4x - 6) = 15
=> 16x2 - 8x + 1 - 8(2x2 - x - 6) = 15
=> 16x2 - 8x + 1 - 16x2 + 8x + 48 = 15
=> 49 = 15 (?) (vô lí)
=> Không tìm được x thoả mãn
b) (5x - 2)(x - 2) - 4(x - 3) = x2 + 3
=> 5x2 - 10x - 2x + 4 - 4x + 12 = x2 + 3
=> 5x2 - 16x + 16 = x2 + 3
=> 4x2 - 16x + 16 = 3
=> (2x)2 - 2.2x.4 + 42 = 3
=> (2x - 4)2 = 3
=> \(\left[{}\begin{matrix}2x-4=\sqrt{3}\\2x-4=-\sqrt{3}\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}x=\dfrac{4+\sqrt{3}}{2}\\x=\dfrac{4-\sqrt{3}}{2}\end{matrix}\right.\)
Mong bạn xem lại đề bài!
2)
a) 5x2 - 10xy + 5y2 - 20z2
= 5(x2 - 2xy + y2 - 4z2)
= 5[(x - y)2 - (2z)2]
= 5(x - y - 2z)(x - y + 2z)
b) a3 - ay - a2x + xy
= a(a2 - y) - x(a2 - y)
= (a - x)(a2 - y)
c) 3x2 - 6xy + 3y2 - 12z2
= 3(x2 - 2xy + y2 - 4z2)
= 3[(x - y)2 - (2z)2]
= 3(x - y - 2z)(x - y + 2z)
d) x2 - 2xy + tx - 2ty
= x(x - 2y) + t(x - 2y)
= (x + t)(x - 2y)