How to be completely flat in junior one mathematics?

The first problem: the solution to the problem: disassemble the completely flat way, and then merge similar items. Original formula =πr? -πr？ +4πr-4π=4π(r- 1).

The second question: Solution: Just change the formula into the simplest form. Original formula =4x? -4xy+y？ -4x？ -4xy+8y？ =y(9y+8x).

By analogy, the third, fifth, sixth, seventh and eighth questions are not difficult.

The fourth question is purely an arithmetic problem. Just do it directly.

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