A pile of watermelons, half is less than half. How many watermelons are there in this pile?

Analysis: The key to this problem is to clarify the meaning of the problem. A pile of watermelons is half 1/2 and half 1/4. Take 1/4 as a whole and then divide it into half 1/8.

Suppose: there are x watermelons, half of which are 1/2X, half are 1/4X, and the other half are 1/8X.

Column equation:1/8x =1/4x-1/2.

Transfer item:1/8x-1/4x =-1/2.

Merge:-1/8X=- 1/2

The coefficient is 1: x = 4.

There are four watermelons.

Multiplication and division rule of extended data score

1, the fraction is multiplied by the integer, the denominator remains the same, the numerator is multiplied by the integer, and finally the score that can be reduced is quoted.

2. The score is multiplied by the score, the numerator is multiplied by the numerator, and the denominator is multiplied by the denominator, and finally the offer score that can be reduced is obtained.

3. Fraction divided by integer, denominator unchanged. If the numerator is a multiple of an integer, divide the numerator by the integer, and finally you can reduce the number of offer points.

4. Fraction divided by integer, denominator unchanged. If the numerator is not a multiple of an integer, multiply this score by the reciprocal of the integer, and finally the offer score can be reduced.

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