które wyrazenie bedzie wynosiło a-b a które a+b trzeba obliczyć wszystkie prosze o obliczenia
A. a-1- (b-1)
B.a- (1- b ) + 1
C. a - ( -b - 1 ) - 1
D.a - ( - b+1 ) +1
E. - ( 1 - a ) - b - 1
F.( a - 1 ) - ( b - 1)
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A. a-1-(b-1)= a- 1-b +1= -1+1+a-b=a-b
B.a -(1-b)+1= a-1+b+1= a+b
C. a - ( -b - 1 ) - 1= a +b +1-1= a+b
D.a - ( - b+1 ) +1 = a+b -1+1 = a+b
E. - ( 1 - a ) - b +1 = -1 +a -b +1 = a-b
F.( a - 1 ) - ( b - 1) = a -1 -b +1 = a-b
a+b :
B; C;D
a-b:
A;E;F