Odpowiedzi

2010-02-25T17:47:04+01:00
Zadanie 2.

a) (y+4)-(2y-3x+1)=
=y+4-2y+3x-1=
=3x+y+3

b) -3×(2x-y+5)=
=-6+3y-15

c) -(2x+y)+(3x-4x)=
=2x-y+3x-4x=
=x-y

d) (n-2)-(4m+5n-7)=
=n-2-4m-5n+7=
=-4m-4n+5

e) 4(-2x-y+5)=
=-8x-4y+20

f) -2(xy)-3(x+1)-(y-4)=
=-2x×(-2y)-3x-3-y+4=
=-5x-3y+1