16y^2+2yz+40y+5z=

a: \(-3xy^2+x^2y^2-5x^2y\)

\(=xy\left(-3y+xy-5x\right)\)

c: \(y^2+xy+y=y\left(y+x+1\right)\)

a: \(C-D=x^2y^2+3xy+y^2-5xy-x^2-2x^2y^2+y^2+xy+5\)

\(=-x^2y^2-xy+2y^2+5\)

b: \(D-C=x^2y^2+xy-2y^2-5\)

b)x²(x+1)-(x+1)=(x+1)(x²-1)

d) 4x(x-2)-(x-2)=(x-2)(4x-1)

câu a bn ghi mik k hỉu

B1 : a, M = x³-3xy(x-y)-y³-x²+2xy-y²

= ( x³-y³)-3xy(x-y) -(x²-2xy+y²)

= (x-y)(x²+xy+y²)-3xy(x-y)-(x-y)²

= (x-y) [(x²+xy+y²-3xy-(x-y)]

= (x-y)[(x²-2xy+y²)-(x-y)

= (x-y)[(x-y)²-(x-y)]

= (x-y)(x-y)(x-y-1)

= (x-y)²(x-y-1)

= 7²(7-1) = 49 . 6= 294

N = x²(x+1)-y²(y-1)+xy-3xy(x-y+1)-95

= x³+x²-(y³-y²)+xy-(3x²y-3xy²+3xy)-95

= x³+x²-y³+y²+xy-3x²y+3xy²-3xy-95

= (x³-y³)+(x²-2xy+y²)-(3x²y+y²)-(3x²y-3xy²)-95

=(x-y)(x²+xy+y²)+(x-y)²-3xy(x-y)-95

= (x-y)(x²+xy+y²+x-y-3xy)-95

= (x-y)[(x²-2xy+y²)+(x-y)]-95

= (x-y)[(x-y)²+(x-y)]-95

=(x-y)(x-y)(x-y+1)-95

= (x-y)²(x-y+1)-95

= 7²(7+1)-95=297

a: \(P=2x^2+3xy+y^2=\left(2x+y\right)\left(x+y\right)\)

\(=\left(2\cdot\dfrac{-1}{2}+\dfrac{2}{3}\right)\left(\dfrac{-1}{2}+\dfrac{2}{3}\right)\)

\(=\dfrac{-1}{3}\cdot\dfrac{1}{6}=-\dfrac{1}{18}\)

d: \(Q=\dfrac{-1}{3}x^4y^2=\dfrac{-1}{3}\cdot16\cdot\dfrac{1}{16}=-\dfrac{1}{3}\)

a, 3x² - 3xy - 5x + 5y

= 3x(x - y) - 5(x - y)

= (x - y)(3x - 5)

b khó nhìn gê :( chỗ 2x^2 y á

c, x² + x - 56

= x² + 8x - 7x - 56

= x(x + 8) - 7(x + 8)

= (x + 8)(x - 7)

b) \(x^3+2x^2y+xy^2-4x\)

\(=x\left(x^2+2xy+y^2-4\right)\)

\(=x\left[\left(x+y\right)^2-2^2\right]\)

\(=x\left(x+y+2\right)\left(x+y-2\right)\)

a)\(3xy+5xy^2-xy^2\)

\(=3xy+4xy^2=xy\left(4y+3\right)\)

b)\(x\left(y-x\right)+3\left(y-x\right)\)

\(=\left(x+3\right)\left(y-x\right)\)