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b)137²-37²=(137-37)(137+37)=100*174=17400
c)33²-32²=(33-32)(33+32)=1*55=55
d)29²-31²=(29-31)(29+31)=-2*60=-120
e)103²-97²=(103-97)(103+97)=6*200=1200
f)201²-199²=(201-199)(201+199)=2*400=800
g)139²-141²=(139-141)(139+141)=-2*280=-560
h)801²-799²=(801-799)(801+799)=2*1600=3200
i)1998²-2002²=(1998-2002)(1998+2002)=-4*4000=-16 000