有理数的简便运算1991X19901990-1990X19911991135X271+136/136X271-135
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/22 00:35:15
![有理数的简便运算1991X19901990-1990X19911991135X271+136/136X271-135](/uploads/image/z/5293981-37-1.jpg?t=%E6%9C%89%E7%90%86%E6%95%B0%E7%9A%84%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%971991X19901990-1990X19911991135X271%2B136%2F136X271-135)
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