化简∶2a/a²-4+1/2-a
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/05 06:12:26
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化简∶2a/a²-4+1/2-a
化简∶2a/a²-4+1/2-a
化简∶2a/a²-4+1/2-a
2a/(a^2-4)+1/(2-a)
=2a/[(a+2)(a-2)]-1/(a-2)
=[2a-(a+2)]/[(a+2)(a-2)]
=(a-2)/[(a+2)(a-2)]
=1/(a+2)
-a的平方+2a分之4-7a