The munber of diagonals that can drawn i a regular polygon with twenty sides is______

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• The munber of diagonals that can drawn i a regular polygon with twenty sides is______
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• The number of diagonals that can be drawn in a regular polygon with21:00前要,如果有算式要列算式!+_+是The number of diagonals that can be drawn in a regular polygon withtwenty sides(icosagon) is___________.
• 英语翻译1、Did you know?In the decimal number system (base 10) ten different digits,0 to 9,are used to write all the numbers.In the binary number system (base 2) two different digits are used,i.e.0 and 1.Which one of the following numbers is not a valid number in theoctal number system (base 8)?A) 128 B) 127 C) 126 D) 125 E) 1243、The number of diagonals that can be drawn in a regular polygon withtwenty sides (icosagon) is_____.4、If a and b are integers,10Ä
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