几除以几等于0.7(7循环)
人气：410 ℃ 时间：2019-12-01 08:56:08
解答
设被除数为x,除数为y,则由题意有：x-0.7y=0.1x即 0.9x-0.7y=0x=(7/9)yx取任意值带入上式,求出y,即可的一组满足条件的数 例如：x=1,y=9/7,x÷y=7/9=0.7777……x=2,y=18/7,x÷y=2×7/18=7/9=0.7777…………x=7,y=9,x÷...
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