2x+4=2y
(x^2y^2 - x^2y + 4xy + 2x - 4) + (-x^2y^2 - 6x^2y - xy + 2x+4) - (2x^2y^2 - 3xy +x - 4)
=
(x^2y^2 - x^2y + 4xy + 2x - 4) + (-x^2y^2 - 6x^2y - xy + 2x+4)
=
tìm\(n\in N\) biết
\(x^2y^4+2x^2y^4+3x^2y^4+...+nx^2y^4=2x^2y^4\)
\(\dfrac{1-2x}{6x^2y}+\dfrac{3+2y}{6x^2y}+\dfrac{2x-4}{6x^2y}\)
\(=\dfrac{1-2x+3+2y+2x-4}{6x^2y}=\dfrac{2y}{6x^2y}=\dfrac{1}{3x^2}\)
A= 2x^2 -1 1/2x^2y-y^4- 3
B= 2x^3 - 4x^2y + 1 1/3 xy^3 - y^4 + 1
Giaỉ phương trình nghiệm nguyên \(2x^2y^4+2y^4+y^2+5x+2y+2x^2+1=5xy^4\)
a)(2x+5)(4-3x). b)(3xy+2x^2)(-3x^2+xy). C)(-1/2x^2y+6x)(-2x+1/2x^2y)
a: (2x+5)(4-3x)
=8x-6x^2+20-15x
=-6x^2-7x+20
b: (3xy+2x^2)*(-3x^2+xy)
=-9x^3y+3x^2y^2-6x^4+2x^3y
=-7x^3y+3x^2y^2-6x^4
c: (-1/2x^2y+6x)(1/2x^2y-2x)
=-1/4x^4y^2+x^3y+3x^3y-12x^2
=-1/4x^4y^2+4x^3y-12x^2
a) \(\left(2x+5\right)\left(4-3x\right)\)
\(=2x\left(4-3x\right)+5\left(4-3x\right)\)
\(=8x-6x^2+20-15x\)
\(=-6x^2+\left(8x-15x\right)+20\)
\(=-6x^2-7x+20\)
b) \(\left(3xy+2x^2\right)\left(-3x^2+xy\right)\)
\(=3xy\left(-3x^2+xy\right)+2x^2\left(-3x^2+xy\right)\)
\(=-9x^3y+3x^2y^2-6x^4+2x^3y\)
\(=3x^2y^2+\left(-9x^3y+2x^3y\right)-6x^4\)
\(=3x^2y^2-7x^3y-6x^4\)
c) \(\left(-\dfrac{1}{2}x^2y+6x\right)\left(-2x+\dfrac{1}{2}x^2y\right)\)
\(=-\dfrac{1}{2}x^2y\left(-2x+\dfrac{1}{2}x^2y\right)+6x\left(-2x+\dfrac{1}{2}x^2y\right)\)
\(=x^3y-\dfrac{1}{4}x^4y^2-12x^2+3x^3y\)
\(=\left(x^3y+3x^3y\right)-\dfrac{1}{2}x^4y^2-12x^2\)
\(=4x^3y-\dfrac{1}{2}x^4y^2-12x^2\)
Bai 1 TINH
a) x ^2 . x -2x^3
b) 6 x^2y . 3xy - 2y^2.x +y
C) 4x^2 +5x -1 .2x^3 -3x
d)-8x^3y + 2y^4 . 3xy^3 - 2x^4 +7y^4
GIUP MINH NHÀ
(4x^5 y^4+2x^2y^3-6x^3y^2):2x^2y^2