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第1个回答 2020-01-06
(5/6-3/4)×(5/6+3/4)
=(5/6)平方-(3/4)平方
=25/36-3/16
=100/144-27/144
=73/144本回答被网友采纳
=(5/6)平方-(3/4)平方
=25/36-3/16
=100/144-27/144
=73/144本回答被网友采纳
第2个回答 2020-01-06
(5/6-3/4)×(5/6+3/4)
=5/6×5/6-3/4×3/4
=25/36-9/16
=5/6×5/6-3/4×3/4
=25/36-9/16
第3个回答 2020-01-06
平方差公式 (5/6)²-(3/4)²
第4个回答 2020-01-06
(5/6-3/4)×(5/6+3/4)
=(5/6)×(5/6)-(3/4)×(3/4)
=(25/36)-(9/16)
=100/144-81/144
=19/144
=(5/6)×(5/6)-(3/4)×(3/4)
=(25/36)-(9/16)
=100/144-81/144
=19/144
第5个回答 2020-01-06
用公式(a-b)x(a+b)=a²-b²
(5/6-3/4)x(5/6+3/4)
=(5/6)²-(3/4)²
=4¾
(5/6-3/4)x(5/6+3/4)
=(5/6)²-(3/4)²
=4¾