有理数的简便运算1991X19901990-1990X19911991135X271+136/136X271-135
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有理数的简便运算1991X19901990-1990X19911991135X271+136/136X271-135
有理数的简便运算
1991X19901990-1990X19911991
135X271+136/136X271-135
有理数的简便运算1991X19901990-1990X19911991135X271+136/136X271-135
1991×19901990-1990×19911991=1991×1990×10001-1990×1991×10001=0
题目意思是不是:(135×271+136)/(136×271-135)=(135×271+136)/[(135+1)×271-135]=(135×271+136)/(135×271+271-135)=(135×271+136)/(135×271+136)=1
135X271+136/136X271-135
=135x271+136/135x271-135+275
=4