40X+10Y=120
30X+10Y=95
可知X=2.5
所以,一根跳绳是2.5元.
40根跳绳和10个小皮球共120元,30根跳绳和10个小皮球共95元.一根跳绳多少元钱?
40根跳绳和10个小皮球共120元,30根跳绳和10个小皮球共95元.一根跳绳多少元钱?
数学人气:772 ℃时间:2019-11-04 12:44:36
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