Sorry for the update time for my sister's lecture.

After dinner, I started to talk about it, and only now did I explain two questions to her, one is the question of paying the water and electricity bills, and the other is the question of paying the phone bill to choose which plan is cost-effective.

It's all very common to solve problems, but when I look at her like that, I guess I'm still ignorant after talking for a long time, so she's still in the upper middle of their class.

I really don't know what the teaching level of public schools is now...... Hey, I'm afraid of harmony, so I won't say more.

There are also four problems, three of which are Olympiad problems, she has never learned a one-dimensional equation, she must use primary school knowledge to turn her head, and I am not a professional, this is really a troublesome thing, a waste of time, and it makes me feel like I am broken.

I don't want to, and I can't tell her the answer directly, it's really embarrassing!

No wonder it is said online that tutoring homework is a painful thing.

Anyway, I'm ready to go to bed at one o'clock in the morning.

I'm sorry, but I hope you understand me.

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