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13 tháng 4 2020

x=1;y=-1;z=2 nhé bn đấy là tìm mò còn lời giải để mình nghĩ cái ( hơi lâu đấy =((( )

2 tháng 5 2016

Ta có:

\(A=x^2yz=x.x.y.z=x.xyz\left(1\right)\)

\(B=xy^2z=x.y.y.z=y.xyz\left(2\right)\)

\(C=xyz^2=x.y.z.z=z.xyz\left(3\right)\)

Lấy (1)+(2)+(3),vế theo vế ta được:

\(A+B+C=x.xyz+y.xyz+z.xyz=\left(x+y+z\right).xyz=xyz\) (vì x+y+z=1)

Vậy A+B+C=xyz      (đpcm)

\(A+B+C=x^2yz+xy^2z+xyz^2=xyz\left(x+y+z\right)=xyz\)

6 tháng 3 2022

\(A=x^2yz\) \(B=xy^2z\) \(C=xyz^2\)

\(A+B+C=x^2yz+xy^2z+xyz^2\)

                    \(=xyz\left(x+y+z\right)=xyz.1=xyz\)

 

7 tháng 5 2021

help meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

7 tháng 5 2021

hộ caiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

15 tháng 5 2017

a) 2x2yz + 4xy2z - 5x2yz + xy2z - xyz

= (2x2yz-5x2yz)+(4xy2z+xy2z)-xyz

= -3x2yz + 5xy2z - xyz

b) x3-5xy+3x3+xy-x2+\(\dfrac{1}{2}\)xy-x2

= (x3+3x3)+(xy-5xy+\(\dfrac{1}{2}\)xy)-(x2+x2)

= 4x3-\(\dfrac{7}{2}\)xy-2x2