有一支队伍排队,7个人一组多5人,9人一组又少了2人.这支队伍至少有多少人?
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设这支队伍人数为x; y及z为整数
1) (x - 5) / 7 = y
x-5 = 7y
x = 7y+5
2) (x + 2) / 9 = z
x+2 = 9z
x = 9z -2
9z - 2 = 7y +5
9z = 7y+ 7
9z = 7 (y+1)
z = 7 (y+1)/9
因y, z为整数, 所以最小的 (y+1) = 9
y=8
x= 7(8) + 5
=61
1) (x - 5) / 7 = y
x-5 = 7y
x = 7y+5
2) (x + 2) / 9 = z
x+2 = 9z
x = 9z -2
9z - 2 = 7y +5
9z = 7y+ 7
9z = 7 (y+1)
z = 7 (y+1)/9
因y, z为整数, 所以最小的 (y+1) = 9
y=8
x= 7(8) + 5
=61
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