Here is another symmetrical equation, but one of the numbers is not written out, and is replaced by a bracket: 12 × 46 () = () 64 × 21 () Here is another symmetrical equation, but one of the numbers is not written out and is replaced by a bracket: 12×46（）=（）64×21 What is the number of () in the formula? Can you work it out with the equation?

Here is another symmetrical equation, but one of the numbers is not written out, and is replaced by a bracket: 12 × 46 () = () 64 × 21 () Here is another symmetrical equation, but one of the numbers is not written out and is replaced by a bracket: 12×46（）=（）64×21 What is the number of () in the formula? Can you work it out with the equation?

Let X be in brackets
12×46x=x64×21
12×460＋12x=2100x+61×21
(2100-12)x=12×460－61×21
2088x=4239
It can be seen that there is no such number, or the number in brackets does not exist

Add the operation symbol and bracket to the left of the medium sign, so that the result is equal to the number on the right, 3,3,3, = 7

3+3+3÷3=7

How to arrange the numbers 123456789 is equal to 1 / 3

5823/17469 = 1/3
5832/17496 = 1/3