Yes When he was in the middle of reading, he found that he had to read an average of 265,438+0 pages every day during the borrowing period. When he reads the first half, how many pages does he read on average every day? If you read X pages every day in the first half of reading, the correct one in the following equation is a:140/x+140/(x-21) =14b; 280/x+280/(x+2 1)= 14c 140/x+ 140/(x+2 1)= 14d 280/x+280/。