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 The Tenth Canadian Mathematical Olympiads 1978年第十届加拿大数学奥林匹克 A square has tens digit 7. What is the units digit? Find all positive integers m, n such that 2m2 = 3n3. Find the real solution x, y, z to x + y + z = 5, xy + yz + zx = 3 with the largest z. ABCD is a convex quadrilateral with area 1. The lines AD, BC meet at X. The midpoints of the diagonals AC and BD are Y and Z. Find the area of the triangle XYZ. Two players play a game on an initially empty 3 x 3 board. Each player in turn places a black or white piece on an unoccupied square of the board. Each player may play either color. When the board is full player A gets one point for every row, column or main diagonal with 0 or 2 black pieces on it. Player B gets one point for every row, column or main diagonal with 1 or 3 black pieces on it. Can the game end in a draw? Which player has a winning strategy if player A plays first? If player B plays first? Sketch the graph of x3 + xy + y3 = 3. 点击此处查看相关视频讲解 在方框内输入单词或词组