b,184^2 - ( 184 - 1)(184 + 1 )=184^2 - 184^2 +1=1
c,58^2 - 116 . 38 + 38^2=58^2 - 2.58 . 38 + 38^2=(58-38)^2=20^2=400
d,180^2−220^2/125^2+150.125+75^2= ( 180 - 220)(180 + 220 )/(125+75)^2
=-40.400/200^2=-40/200=-1/5
g,2005^2=(2000+5)^2=2000^2+2.2000.5+5^2=4000000+20000+25=4020025.