分式化简题一道
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/28 20:45:59
分式化简题一道
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![分式化简题一道](/uploads/image/z/16768175-23-5.jpg?t=%E5%88%86%E5%BC%8F%E5%8C%96%E7%AE%80%E9%A2%98%E4%B8%80%E9%81%93)
[a²/(a+2)-a+2]÷[4a/(a^2-4)]
=[a²/(a+2)-(a-2)]÷[4a/(a+2)(a-2)]
={[a^2-(a-2)(a+2)]/(a+2)}×[(a+2)(a-2)/4a]
={[a^2-(a^2-4]/(a+2)}×[(a+2)(a-2)/4a]
=[4/(a+2)]×[(a+2)(a-2)]/4a
=4(a-2)/4a
=(a-2)/a
=[a²/(a+2)-(a-2)]÷[4a/(a+2)(a-2)]
={[a^2-(a-2)(a+2)]/(a+2)}×[(a+2)(a-2)/4a]
={[a^2-(a^2-4]/(a+2)}×[(a+2)(a-2)/4a]
=[4/(a+2)]×[(a+2)(a-2)]/4a
=4(a-2)/4a
=(a-2)/a