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2019ҵλְ⿼Ա:̷Ӧ

2019-08-13 11:55:44| й

2019ҵλƸڽŵı׶ΣΪ˰λܹõıսҵλԣйΪ׼ҵλְ⿼Դ⼼ɣ̷Ӧãϣλܼʱ鿴һ֮

ϵһֱҵλв⿼еѵ㣬ͬѧһ־ֱӷˣѡһ𰸣ȻȷʲߡʵϸϵĿԷ֣󲿷ֶǴСϤķҲǷ̷̷Ӧ?ǽͨ˵

1¼ԱСźСҪһ¼СһҪ8СʱСһҪ10Сʱڹͬ3СʱСʻ˼ңڼСһֱڹСغ1СʱĹУСűС๤˼Сʱ?

йһĿȻҪɵĶͬһDzֱΪ“1”“СһҪ8Сʱ”ɵСÿСʱ1/8“СһҪ10Сʱ”ɵСÿСʱ1/10,“ͬ3Сʱ”ɵ(1/8+1/10)×3,“Сʻ˼ңڼСһֱڹ”ɵСŹʱδ֪ΪxСʱС1/10x,“Сغ1Сʱ”ɵ(1/8+1/10)×1,“1”ˣʽΪ

x=1ҲСűС๤˵1Сʱ

2ABظһͬĻijÿɽÿ͵ĻͬȴAس;10ê˳䣬ʹ೵ÿٶ2䣬Bж15̣뷵̵Ŀÿȳʱװ6䡣ôعл?

й⽲ǰһA˵BأְͬĻB˵Aصһ̣Уÿ͵ڱ仯Ҳڱ仯ǵûз仯ǿϵʽ

ÿ͵δ֪ΪxҲδ֪ΪyΪxyABĹxy=(x+2)(y-10)BAĹxy=(x+6)(y-25)x=18y=100ôعл18×100×2=3600䡣

ڽвѷ֣ʵǰɵ˼÷̷ѣһָΪʽʽչĹϵ̲ӡշ̷ľ裬Ŵ󲿷ϵĿûôˡ

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