小學數學急

2007-10-12 6:15 am

鉛筆2枝,鉛子筆1枝就$16.9...鉛筆1枝,鉛子筆2枝就$15.2...問鉛筆1枝,鉛子筆1枝機多錢

回答 (4)

2007-10-12 6:53 am

✔ 最佳答案

鉛筆2枝 + 鉛子筆1枝 = $16.9
鉛筆1枝 + 鉛子筆2枝 = $15.2
相加
鉛筆3枝 + 鉛子筆3枝 = $16.9 + $ 15.2 = $32.1
鉛筆1枝 + 鉛子筆1枝 = $32.1 / 3 = $10.7

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2007-10-13 6:43 am

2y+x=16.9
y+x=16.9/2
y+x=8.5

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2007-10-12 3:32 pm

鉛筆2枝,鉛子筆1枝就$16.9...鉛筆1枝,鉛子筆2枝就$15.2...問鉛筆1枝,鉛子筆1枝機多錢 ?

$(16.9+15.2)/3

=22.1/3

=7.2

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2007-10-12 6:21 am

鉛筆1枝,鉛子筆1枝
= $(16.9 + 15.2)/3
= $ 10.7

2007-10-11 22:23:42 補充：
$16.9 $15.2 = (鉛筆2枝鉛子筆1枝鉛筆1枝鉛子筆2枝)的錢 = 鉛筆3枝鉛子筆3枝的錢

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