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Lời Giải
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Ví dụ phổ biến
the sum of two numbers is 53. If their hiệu is 25 find both numbersThe sum of twice a number and 19 is-23Find the diện tích of the triangle with a = 19, b = 14, c = 19. Round to the nearest tenthkhai triển the sum of two consecutive numbers is 25The đường kính of a circle is 20 m. Find its area in terms of pipi.