181^2-61^2/301^2-181^2是多少?

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181^2-61^2/301^2-181^2是多少?181^2-61^2/301^2-181^2是多少?181^2-61^2/301^2-181^2是多少?(181?-61?)/(301?-181?)

181^2-61^2/301^2-181^2是多少?
181^2-61^2/301^2-181^2是多少?

181^2-61^2/301^2-181^2是多少?
(181?-61?)/(301?-181?) =[(181+61)(181-61)]/[(301+181)(301-181)] =(242×20)/(482×120) =121/1446