来自刘秀月的问题
液晶电视正面的长方形外框的长为a,宽为b：屏幕在中间,外框都为5cm,如图.求屏幕的面积与长方形外框的面积的比,当a=65cm,b=52cm时,这个比值是多少?
液晶电视正面的长方形外框的长为a,宽为b：屏幕在中间,外框都为5cm,如图.求屏幕的面积与长方形外框的面积的比,当a=65cm,b=52cm时,这个比值是多少?
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2020-03-11 02:03
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李敏哲
屏幕的长宽分别为：a-10、b-10
屏幕面积为：(a-10)(b-10)
屏幕面积与长方形外框面积的比为：(a-10)(b-10)/(ab)=1-10/a-10/b+100/(ab)
=1-10/65-10/52+100/(65x52)
=321/338
2020-03-11 02:05:33
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