Odpowiedzi

2010-02-19T19:59:47+01:00
(x-2) - (2-x) = x-2-2+x=2x-4
(a+b) + (2a-b) - (a - 2b)= a+b+2a-b-a+2b= 2a+2b
(3x-y+ 1 ) - (x + y ) + (y - x ) = 3x-y+1-x-y+y-x=x-y+1
2010-02-19T20:02:13+01:00
(x-2) - (2-x)=x-2-2+x=2x-4

(a+b) + (2a-b) - (a - 2b)=a+b+2a-b-a+2b=3b+2a

(3x-y+ 1 ) - (x + y ) + (y - x )=3x-y+1-x-y+y-x=x-y+1
2010-02-19T20:04:51+01:00
1 .(x-2) - (2-x) = x-2-2+x=2x-4
2. (a+b) + (2a-b) - (a - 2b)= a+b+2a-b-a+2b= 2a+2b
3. (3x-y+ 1 ) - (x + y ) + (y - x ) = 3x-y+1-x-y+y-x=x-y+1