M=5x2y+5x-3;N=xyz-4x2y+5x-2
M+N=
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Ta có:
C(x) = (5x2y - 4xy2 + 5x - 3) - (xyz - 4x2y + xy2 + 5x - 1)
= 5x2y - 4xy2 + 5x - 3 - xyz + 4x2y - xy2 - 5x + 1
= -xyz + 9x2y - 5xy2 - 2
Chọn C
a: \(=xy\left(5x-1\right)\)
b: \(=\left(x-2\right)\left(3x-5\right)\)
a)\(5x^2y+15xy^2=5xy\left(x+y\right)\)
b) \(3x-3+5x\left(x-1\right)=3\left(x-1\right)+5x\left(x-1\right)=\left(x-1\right)\left(3-5x\right)\)
c)\(x^2-2xy-9+y^2=\left(x^2-2xy+y^2-9\right)=\left(x-1\right)^2-9=\left(x-1-9\right)\left(x-1+9\right)=\left(x-10\right)\left(x+8\right)\)
a,=5xy(x-2y)
b,=3(x+3)+(x-3)(x+3)
=(x+3)+x
c=xy(x-y)+z(x-y)
=(x-y)(xy+z)
d=7xy(2x-3y+4xy)
e,=x(x+y)-5(x+y)
= (x+y)(x-5)
f, =10x(x-y)+8(x-y)
=(x-y)(10x+8)
g,=(3x+1-x+1)(3x+1+x+1)
=2x(4x+2)
h,=x^2-3x-2x+6
= x(x-3)-2(x-3)
=(x-3)(x-2)
\(a,5x^2y-10xy^2=5xy\left(x-2y\right)\\ b,x^2+2xy+y^2-5x-5y=\left(x+y\right)^2-5\left(x+y\right)=\left(x+y\right)\left(x+y-5\right)\\ c,x^2-6x+8=\left(x^2-2x\right)-\left(4x-8\right)=x\left(x-2\right)-4\left(x-2\right)=\left(x-2\right)\left(x-4\right)\\ d,5x^2-10xy+5y^2-20z^2=5\left(x^2-2xy+y^2-4z^2\right)=5\left[\left(x-y\right)^2-\left(2z\right)^2\right]=5\left(x-y-2z\right)\left(x-y+2z\right)\)
a) x(3 - x) + (x + 1)(x - 1)
= 3x - x2 + x2 - x + x - 1
= 3x - 1
\(M+N=5x^2y+5x-3+xyz-4x^2y+5x-2\\ M+N=x^2y+10x+xyz-5\)
\(M+N=5x^2y+5x-3+xyz-4x^2y+5x-2=x^2y+10x+xyz-5\)