Tạp chí Toán học tuổi thơ 2 kỳ số 171

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Given a set {1; 2; 3} and a relation
{(1, 1); (2, 1); (1, 3); (3, 2)} on the set (a
relation from to ). The statement is true if
and only if ( , ) . If is not true, we
denote it as . Determine which of the
following statements are true.

a) ; b) 3 2 c) 1 1 d) e) 2 3

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In the calculation of a division, due to the
fading of the ink, only some numbers are
readable. Given that this is a correct division with
digits represented by are the same and the
digits can be different. Find the
faded digits.

Let be a right isosceles triangle with
the vertex at and 2 cm. Let and be
the points on and , respectively, such that
. Find the minimum value of the length of .

Solve the following simultaneous

equations

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