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數學問題0.0請幫幫我> <

Dec 23rd 2013, 10:36

你好:)

※第一題

甲的錢是乙的3倍少125元
所以→ (75×3)-125
=225-125
=100→甲的錢

丙的錢是甲的2倍少75元
所以→(100×2)-75
=200-75
=125→丙的錢

A:甲有100元，丙有125元

※第二題

90-75=15→每個便宜多少
共買30個
所以→15×30=450

A:便宜450元

※第三題

假設哥哥有β元
大雄原有75元
所以→75+25=β-25
=100=β-25
=100+25=β
β=125

A:哥哥原有125元

希望能幫到你:)

參考資料：自己

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