Search People's Publishing House in Baidu. After entering the home page, find high school and mathematics in the "subject direct" (middle position). Click to enter and find the "Teacher Center" (middle position). There is a "teacher's book" on the lower left. Click to enter. The following are essential:

If you want to find the answer to 1. 1, just select 1.2, press "Previous" (it will take a while to come out), and press it several times to find it. By analogy, the answers in all exercises and exercises can be found. My Chinese is not very good. I hope you don't mind. It's a bit messy and awkward.