Mathematical multiplication and division jokes

There are generally two ways to answer this question: the first way is cross-elimination. For example, the numerator on the left corresponds to the denominator on the right, and the denominator on the left corresponds to the numerator on the right (cross, right) to see if it can be eliminated. This problem 3 and 15 are divided by 3, that is, 3 becomes 1 and 15 becomes 5; When both 5 and 5 are divided by 5 and become 1, then the formula becomes11multiplied by 1/5, then the numerator is multiplied by the numerator, and the denominator is multiplied by the denominator, and the answer is 1/5. The second one is multiplied and then eliminated. Is the numerator multiplied by the numerator, the denominator multiplied by the denominator to get 15/75, and then simplify (will you simplify? I won't ask you how to simplify. ) also get 1/5.

That's basically it. The number on the right of your example is not the simplest form. It can be converted into 1/3, and then calculated by cross elimination method (the first method). Generally use the first one, which is relatively simple ~

Is it okay? Hope to adopt ~ _