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Senior one mathematics compulsory subject exercise 1.2 answer to the ninth question.
You go to the website of People's Education Publishing House to find a book for senior one math teachers.

Have an answer

I wonder what version you have.

But there are several versions there.

(Be sure to think for yourself before reading the answer ~ ~)

I believe you will learn how to assemble ~ ~

PS: You and I are both senior one students ~ ~ Hehe! ! !