英语翻译find a counterexample to disprove the statement"The Associative Property is true for division."求回答,最好是英文的

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• 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