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[" 70.Let "D" be the middle point of the side "BC" of a triangle ABC."],[" If the triangle "ADC" is equilateral,then "a^(2):b^(2):c^(2)" is equal to "],[[" (a) "1:4:3" (b) "4:1:3," (c) "4:3:1," (d) "3:4:1]]

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