Odpowiedzi

2010-04-07T14:38:21+02:00
A ) . a+ (a + b) =a+a+b=2a+b
b ) . 2x - ( x + 4) =2x-x-4=x-4
c ) . 7 - ( - x + 6) =7+x-6=x+1
d ) . - ( x + 4 ) + ( x - 5 ) =-x-4+x-5=-9
e ) . 1-( t + p ) - ( t - 2 ) =1-t-p-t+2=-2t-p+3
f ) . - ( -y + 2 ) + ( - 2y - 4 ) =y-2-2y-4=-y-6