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1/5x7 means the sum of seven 1/5.

Addition calculation:

1/5+ 1/5+ 1/5+ 1/5+ 1/5+ 1/5+ 1/5=( 1+ 1+ 1+ 1+ 1+ 1+ 1)/5=7/5

Calculate by multiplication:

1/5x7=( 1x7)/5=7/5

It is concluded that fractions are multiplied by integers, and molecules are multiplied by integers and fractions, and the denominator remains unchanged.

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