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sau bạn đăng tách ra cho mn cùng giúp nhé
a, \(\left(-2x^5+3x^2-4x^3\right):2x^2=-x^3+\frac{3}{2}-2x\)
b, \(\left(x^3-2x^2y+3xy^2\right):\left(-\frac{1}{2}x\right)=-\frac{x^2}{2}+xy-\frac{3y^2}{2}\)
c, \(\left(3x^2y^2+6x^3y^3-12xy^2\right):3xy=xy+2x^2y^2-4y\)
d, \(\left(4x^3-3x^2y+5xy^2\right):\frac{1}{2}x=2x^2-\frac{3xy}{2}+\frac{5y^2}{2}\)
e, \(\left(18x^3y^5-9x^2y^2+6xy^2\right):3xy^2=6x^2y^3-3x+2\)
f, \(\left(x^4+2x^2y^2+y^4\right):\left(x^2+y^2\right)=\left(x^2+y^2\right)^2:\left(x^2+y^2\right)=x^2+y^2\)
a: \(N=\dfrac{3x^5-4x^4+6x^3}{-2x^2}=-\dfrac{3}{2}x^3+2x^2-3x\)
b: \(N=\dfrac{\left(6x^4y^5-3x^3y^4+\dfrac{1}{2}x^4y^3z\right)}{-\dfrac{1}{3}x^2y^3}=-18x^2y^2+9xy-\dfrac{3}{2}x^2z\)
c: \(\Leftrightarrow N\cdot\left(y-x\right)=\left(x-y\right)^3\)
\(\Leftrightarrow N=\dfrac{\left(x-y\right)^3}{y-x}=-\left(y-x\right)^2\)
d: \(\Leftrightarrow N\cdot\left(y^2-x^2\right)=\left(y^2-x^2\right)^2\)
hay \(N=y^2-x^2\)
Sửa đề: B=-2x^2+xy+2y^2-3-5x+2y
a: A+B+C
=x^2-3xy-y^2+2x-3y+1-2x^2+xy+2y^2-3-5x+2y+C
=-x^2-2xy+y^2-3x-y-2+3x^2+7y^2-4xy-6x+4y+5
=2x^2+8y^2-6xy-9x+3y+3
b: 7A-B-C-9
=7A-9-(x^2+9y^2-3xy-11x+6y+2)
=7x^2-7y^2-21xy+14x-21y+7-x^2-9y^2+3xy-11x-6y-2-9
=6x^2-16y^2-18xy+3x-27y-4
a: =18x^3y^2-12x^3y^3+6x^2y^2
b: (-3x+2)(5x^2-1/3x+4)
=-12x^3+x^2-12x+10x^2-2/3x+8
=-12x^3+11x^2-38/3x+8
c: =x^2-x-2+3x-x^2
=2x-2
d: =4x^2+12x+9-4x^2+25-(x-1)(x^2+12)
=12x+34-x^3-12x+x^2+12
=-x^3+x^2+46
a: \(=3y^2-5x^2y^3-2y^2+3x^2y^3=y^2-2x^2y^3\)
b: \(=6x-y+2x^2+3y^2-2x^2+x=7x-y+3y^2\)
c: \(=x-y+4y^2-6xy+\dfrac{10x^2}{y}\)
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) \(\left(-\dfrac{1}{2}x^2y+6x\right)\left(-2x+\dfrac{1}{2}x^2y\right)\)
\(=-\dfrac{1}{2}x^2y\left(-2x+\dfrac{1}{2}x^2y\right)+6x\left(-2x+\dfrac{1}{2}x^2y\right)\)
\(=x^3y-\dfrac{1}{4}x^4y^2-12x^2+3x^3y\)
\(=\left(x^3y+3x^3y\right)-\dfrac{1}{2}x^4y^2-12x^2\)
\(=4x^3y-\dfrac{1}{2}x^4y^2-12x^2\)