Odpowiedzi

2009-04-14T11:41:47+02:00
(2a - 3b) + (-2a + 4b) =2a-3b-2a+4b=b

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

3 (a +4b - 2 ) = 3a+12b-6

2 ( x - y ) - 3 (x + 1) + ( y - 4 ) = 2x-2y-3x-3+y-4=-x-y-7

2a ( x + 5y ) + 3x ( a - 5 y ) = 2ax+10ay +3ax-15xy=5ax+10ay-15xy