abcde x 9 = edcba
so phai tim la
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Tìm số abcde biết abcde x 9 = edcba .
Trả lời :Só phải tim là : ?
\(abcde\times9=edcba\)
\(\Rightarrow a=1\Rightarrow e=9.\)
\(\Rightarrow1bcd9\times9=9dcb1\)
\(\Leftrightarrow\left(10009+10bcd\right)\times9=90001+10dcb\)
\(\Leftrightarrow8+9bcd=dcb\)
\(\Rightarrow b=1\) hoặc \(b=0\)
(loại b = 1.)
\(\Rightarrow b=0\)
\(\Rightarrow d=8\)
\(\Rightarrow10c89\times98c01\)
\(98001\le10c89\times9=98c01\le98901\)
\(10889\le10c89\le10989\)
\(10889\times9=98001\)
\(10989\times9=98901\)
\(\Rightarrow abcde=10989.\)
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tim sôc 2 chu so biet rang neu thêm chu so 1 vao giua 2 chu so cua so do ta duoc so gap 9 lan so phai tim
so phai tim la?
sô 15 nhaaaaaaaaaaaaaaaaaaa
tim mot so co hai chu so biet rang ta viet them chu so 1 va giua hai chu so cua so do ta duoc so moi gap 9 lan so phai tim. trai loi: so phai tim la ... cac giai luon nhe!
tim so abcde: abcde*9=edcba
số đó là 10989 là đúng mình làm trên Violympic rồi
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tim so abcde biet abcde*9=edcba
tim1 so tu nhien biet neu viet them chu so 9 vao tan cung ben phai so do thi duoc so mi hon so phai tim la 1809
tim abcde biet abcde nhân với 9 bằng edcba
10989 dung 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%
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Tim 1 so tu nhien neu viet them chu so 9 vao tan cung ben p[hai cua no thi dc so moi hon so phai tim la 1809 d/vi.
tim mot so co 5 chu so sao cho khi nhan so do voi 9 ta duoc mot so moi co 5 chu so viet theo thu tu nguoc lai so phai tim . So can tim la