Are these sentences correct? How can I improve those for sounding more natural?
1. What has been the toughest math you solved of this book?2. What has been the toughest math you encountered with this book?
he How can I improve those for sounding more natural? What were the toughest math problems you did in this book?
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he
How can I improve those for sounding more natural?
What were the toughest math problems you did in this book?