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