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2022-06-30 23:12:37
46 x 99 = 46 x (100 - 1) = 46 x 100 - 46 = 4600 - 46 = 4554
2022-06-30 23:08:03
a bạn viết sai đề r. 142 không chia hết cho 3 :))
2022-06-30 22:57:09
2022-06-30 22:41:03
2022-06-30 22:29:40
//nhiiscute
a, Quãng đường = Vận tốc trung bình x Thời gian.
Thời gian = 11h15' - 7h30' = 3h45' = 3.75h.
-> Quãng đường = 54 x 3.75 = 202.5km.
b, Thời gian gặp nhau = Quãng đường / Tổng vận tốc 2 xe.
-> Gặp nhau sau: 202.5 / (54 + 36) = 2.25h = 2h15'.
Chỗ gặp nhau cách A: 2.25 x 36 = 81km.
2022-06-30 22:20:45
\(m=\dfrac{2n-7}{n-5}\left(n\ne5\right)\).
Để m không là số âm -> (2n - 7) và (n - 5) cùng dấu.
TH1: (2n - 7) < 0 và (n - 5) < 0.
-> 2n < 7 và n < 5.
-> n < 3,5 và n < 5.
-> n < 3,5.
TH2: (2n - 7) > 0 và (n - 5) > 0.
-> 2n > 7 và n > 5.
-> n > 3,5 và n > 5.
-> n > 5.
Vậy n < 3,5 hoặc n > 5.