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What can't mathematical functions do? Teacher A said that I still couldn't do the problem after I understood it.
⊙⊙·b· Khan I'm only in junior high school, but I've already started to contact functions! Your girlfriend's background. . .

Actually, your girlfriend can ask the teacher. Ask if you don't understand. If you don't ask, you will never understand. Don't be afraid of the teacher laughing. I don't understand, which means that you have contacted it and have a little impression. Thank you for your practice. You can deepen your understanding. Read the examples and concepts in the textbook repeatedly, and you must understand them thoroughly. Long-term use, will certainly reach the point of perfection.