One is the fraction (A is not equal to 0), when the denominator is less than the numerator, it is a false fraction; When the numerator is greater than the denominator, it is a true fraction; When (molecule = 1), it is the decimal unit of the score; When there is no common divisor between numerator and denominator, it is the simplest fraction.

Second, a simplest fraction, if you add 1 to the molecule, you will get about half; If you subtract 1 from the molecule, you get about a quarter and the score is (three-eighths).

Third, fill in the appropriate scores in brackets.

35 cubic decimeter = (7/200) cubic meter 53 seconds = (53/60) hour 25 hectares = (1) square kilometer.

Fourthly, a pile of coal is transported in seven times on average, with 1 for the seventh part of the pile of coal each time and 5/for the seventh part of the pile of coal five times.

5. A rice mill grinds 50 kilograms in 30 minutes, with an average of (5/3) kilograms per minute. According to this calculation, it takes (3/5) minutes to grind 1 kg of rice.

The denominator is a, the maximum true score is (a- 1), and the minimum false score is (a+ 1).