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Division rules of rational numbers in junior one mathematics.
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Rule 1: dividing by a number that is not equal to 0 is equal to multiplying the reciprocal of this number. (Note: 0 has no reciprocal)

Rule two, divide two numbers, the same sign is positive, the different sign is negative, divide by the absolute value. If you divide 0 by anything other than 0, you get 0. )