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hadung82
2 năm trước
Bài 6: Tìm các chữ số x,y biết a) 14x8y chia hết cho 2,3 c) 1x4y chia hết cho cả 2,3,5 b) 56x7y chia hết cho 5,9 d) x45y chia hết cho cả 2,3,5,9. Bài 7: Tìm a)ƯCLN(18,30,42) ; b) ƯCLN(75,15,105) ; c)ƯCLN(37,8,15) d) BCNN(27,45) ; e)BCNN(300,50) ; f)BCNN(12,5,17) Bài 8: a)54 : x ; 90 : x và x > 8 b)360 : x ;495 : x; 1710 : x và x < 30
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