bạn ơi lớp 8 đó:
a, (80+1)^2=80^2+2.80.1+1^2=6400+160+1=6561
b, (100-1)^2=100^2-2.100.1+1^2=10000-200+1=9801
c, (100-3).(100+3)=100^2-3^2=10000-9=9991
d, (100+1)^3=100^3+3.100^2.1+3.100.1^3+1^3=1000000+10000+300+1=1010301
e, (200-1)^3=200^3-3.200^2.1+3.200.1^2-1^3=8000000-120000+600-1=7880599
f, (2000-1).(2000+1)=2000^2-1^2=3999999
gửi bạn nha học tốt nhé