? +,-,? * ,? /

2. Expression of fraction (e.g. 3/5, 7/2)

53 (3/5)

The third power of 3.2 is 8.

2? 3 8

4. Statement of root number (e.g. root number 5)

(5)

Is this the correct way to use it? (+) (-) Yes, but it's basically not used now. One more thing.

Mi Fang: This is an area unit ㎡, not a prescription.