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Which unit is difficult in math class in Hefei No.7 Middle School?
Chapter III Real Numbers Chapter IV Algebraic Expressions.

Chapter 3 Real Numbers Chapter 4 Algebra is the most difficult unit.

Mathematics is a subject that studies concepts such as quantity, structure, change and spatial model. By using abstract and logical reasoning, the shape and motion of objects are counted, calculated, measured and observed. Mathematicians have extended these concepts in order to express new conjectures with formulas and establish strictly deduced truths from properly selected axioms and definitions.