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The answers to the fourth and fifth questions on page 23 of the eighth grade textbook of People's Education Press.
Sorry, I'm too lazy to write the process when I want to do my homework. I don't know how to ask questions. 4.( 1) Original formula =1[2] ... = x+1-x] [3] ... = a+1[6].

5 (1) ... = 7 (2) of10ab ... = 20mn square (square excluding M clam) P square 8m- 15n cubic (3) ... = 2 (x+y) 7y (4) = x+.

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