Odpowiedzi

2010-02-25T20:13:44+01:00
A) (3x-y+1)-(x+y)+(y-x)=3x-y+1-x-y+y-x=2x-y+1

b) -(kx+ny)-(3kx+2ny)+(5kx-3ny)= -kx-ny-3kx-2ny+5kx-3ny=kx

C) (2ab+a+3)-(3ab- a+3)=2ab+a+3-3ab+a-3=-ab+2a
2010-02-25T20:17:15+01:00
A. (3x-y+1)-(x+y)+(y-x)=3x-y+1-x-y+y-x=x-y+1
B. -(kx+ny)-(3kx+2ny)+(5kx-3ny)=-kx-ny-3kx-2ny+5kx-3ny=kx-6ny
C.(2ab+a+3)-(3ab- a+3)=2ab+a+3-3ab+a-3=-ab+2a