Cho các biểu thức sau: A=52−(37+43); B=512−1024+256; C=1128−(27−69)

Ta có

A=52−37+43     =52−80     =−28.

B=512−1024+256     =−512+256     =−256.

C=1128−27−69    =1128−−42    =1128+42    =1170.

D=−128−64−32+16+16     =−128−64−64     =−192−64     =−256.

E=584+969−383     =584+586     =1170.

F=1−2+27     =1−29     =−28.

⇒A=F;B=D;C=E.