181^2-61^2/302^2-182^2=?
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181^2-61^2/302^2-182^2=?181^2-61^2/302^2-182^2=?181^2-61^2/302^2-182^2=?=(181+61)(181-61)/(302-182)(
181^2-61^2/302^2-182^2=?
181^2-61^2/302^2-182^2=?
181^2-61^2/302^2-182^2=?
=(181+61)(181-61)/(302-182)(302+182)
=242x120/120x484
=242/484
=1/2