About Integral Calculus's question. The text book I used is "Advanced calculus" by Folland.

About Integral Calculus's question. The text book I used is "Advanced calculus" by Folland. Chapter 1 "Setting the Stage" ，Chapter 2 "Differential Calculus" and Chapter 3 "The Implicit Function Theorem and its Applications "maybe helpful. The photos of questions, the PDF of the "Advanced calculus" 's solution manual, the photos of class notes and some of my tutorial practice questions(including answers) will be attached. And please pay attention, after I accpted the answers, I will give the amount of $15 as tips. Thanks.