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Mathematics, 10.09.2021 15:30 mayaduke9482

Rong các mệnh đề sau, mệnh đề nào là đúng ? Giải thích ? a) Nếu một số chia hết cho 9 thì số đó cũng chia hết cho 3
b) Nếu một số chia hết cho 3 thì số đó cũng chia hết cho 6.
c) 2 và 3 là hai số nguyên tố cùng nhau.
d) Nếu a b  thì 2 2 a b  .
e) Số  lớn hơn 2 và nhỏ hơn 4.
f) 49 là số chính phương.
g)5 13   .
h) Bình phương của mọi số nguyên dương đều lớn hơn chính nó.

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Rong các mệnh đề sau, mệnh đề nào là đúng ? Giải thích ? a) Nếu một số chia hết cho 9 thì số đó cũ...
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