Odpowiedzi

2010-02-05T15:36:21+01:00
A) (a+b)-(2a-b)-(a-2b)-=
= a+b-2a+b-a+2b =
= -2a+4b

b)(3x-y+1)-(x+y)+(y-x)=
=3x-y+1-x-y+y-x=
=x-y+1

c)-(kx+ny)-(3kx+2ny)+(5kx-3ny)=
= -kx-ny-3kx-2ny+5kx-3ny=
=kx-6ny

d)(2ab+a+3)-(3ab-a+3)=
=2ab+a+3-3ab+a-3=
=-ab+2a
283 4 283