Summer homework new first English page 18, 19, 20, 21, 22, 23

Summer homework new first English page 18, 19, 20, 21, 22, 23

I've been here for a long time. Our teacher never checks the summer homework, and it's useless to do it. If your teacher changes next semester, congratulations. The holiday homework is a piece of waste paper. Now the course is so tight that no teacher is willing to talk about it, We used to send the answers to us. It doesn't matter if we want any answers

A simple method of 47 times 45 / 46 + 1 / 46

=(1+46)*45/46+1/46
=45/46+45+1/46
=1+45
=46

235 minus 49 minus 48 minus 47 minus 46 minus 45

235-49-48-47-46-45
=235-（49+48+47+46+45）
=235-47×5
=235-235
=0