M=5x2y+5x-3;N=xyz-4x2y+5x-2
M+N=
5x2y - 4xy2 +5x - 3 - xyz +4x2y - xy2 -5x +1/2
giúp mình với cần gấp
\(5x^2y-4xy^2+5x-3-xyz+4x^2y-xy^2-5x+\dfrac{1}{2}\\ =\left(5x^2y+4x^2y\right)-\left(4xy^2+xy^2\right)+\left(5x-5x\right)-xyz-\left(3-\dfrac{1}{2}\right)\\ =9x^2y-5xy^2-xyz+\dfrac{5}{2}\)
Cho hai đa thức P ( x ) = ( 5 x 2 y - 4 x y 2 + 5 x - 3 ) , Q ( x ) = x y z - 4 x 2 y + x y 2 + 5 x - 1 . Tìm đa thức C ( x ) b i ế t P ( x ) - C ( x ) = Q ( x )
A. - x y z + 9 x 2 y - 5 x y 2 - 5 x - 2
B. x y z - x 2 y - 5 x y 2 - 2
C. - x y z + 9 x 2 y - 5 x y 2 - 2
D. - x y z + x 2 y - 5 x y 2 - 2
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
Tính:
a) 5x2y - xy
b) 3x( x - 2 ) + 5(2 - x)
c) x2+2x +1 + 9y2
d) x2 - 5y - xy + 5x
a: \(=xy\left(5x-1\right)\)
b: \(=\left(x-2\right)\left(3x-5\right)\)
Phân tích đa thức sau thành nhân tử.
a) 5x2y + 15xy2
b) 3x – 3 + 5x(x – 1)
c) x2 – 2xy – 9 + y2
a, 5xy(x+3y)
b, (x-1)(3+5x)
c, (x-y+3)(x-y-3)
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)\(x^2-2xy-9+y^2=\left(x^2-2xy+y^2-9\right)=\left(x-1\right)^2-9=\left(x-1-9\right)\left(x-1+9\right)=\left(x-10\right)\left(x+8\right)\)
: Phân tích đa thức thành nhân tử.
a) 5x2y - 10xy2 b) 3(x + 3) + x2 - 9 c) x2 – y 2 + xz - yz
d/ 14x2y – 21xy2 + 28x2y2 e/ x(x + y) – 5x – 5y.
f/ 10x(x – y) – 8(y – x). g/ (3x + 1)2 – (x + 1)2 h) x2-5x+6
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)
.Phân tích các đa thức sau thành nhân tử:
a) 5x2y- 10xy2
b) x2 + 2xy + y2 - 5x - 5y
c) x2 – 6x + 8
d)5x2 – 10xy + 5y2 – 20z2
\(a,5x^2y-10xy^2=5xy\left(x-2y\right)\\ b,x^2+2xy+y^2-5x-5y=\left(x+y\right)^2-5\left(x+y\right)=\left(x+y\right)\left(x+y-5\right)\\ c,x^2-6x+8=\left(x^2-2x\right)-\left(4x-8\right)=x\left(x-2\right)-4\left(x-2\right)=\left(x-2\right)\left(x-4\right)\\ d,5x^2-10xy+5y^2-20z^2=5\left(x^2-2xy+y^2-4z^2\right)=5\left[\left(x-y\right)^2-\left(2z\right)^2\right]=5\left(x-y-2z\right)\left(x-y+2z\right)\)
Tính tổng của đa thức B và C như sau:
B = 5x2y + 5x - 3C = xyz - 4x2y + 5x - 1
a) B + C = x2y - 10x + xyz - 2
b) B + C = 9x2y + 10x + xyz - 4
c) B + C = x2y + 10x - 2
d) B + C = x2y + 10x + xyz - 4
gấp ạaa
\(B+C=\left(5x^2y-4x^2y\right)+\left(5x+5x\right)+xyz+\left(-3-1\right)\)
\(B+C=x^2y+10x+xyz-4\)
Thực hiện phép tính
A; X(3-x) +(x+1) (x-1)
B; (5x^3y^2-20^4y+15x2y2) ÷5x2y
C; (x-1) (x2+x+1) +10
Mọi người giúp mình nhé😁😁
a) x(3 - x) + (x + 1)(x - 1)
= 3x - x2 + x2 - x + x - 1
= 3x - 1
Làm tính chia:
a) 22 x 4 y 2 z : 5 x 2 y ; b) x 6 y 7 zt : x 6 y 7 ;
c) ( - 5 x ) 3 y 2 z 2 : 15 x 3 y ; d) 3 8 ( xy 2 ) 5 : − 1 2 x 2 y 2 ;
e) ( - x 3 y 6 z 9 ) 10 : ( xyz ) 15 ; g) ( x - 1 ) 6 : ( x 2 - 2 x + l ) .