Therefore, 1 km2 is equal to 1 km in Fiona Fang.
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Baidu Encyclopedia:
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Fiona Fang is also a mathematical way of thinking, which refers to a way to express and explain mathematical knowledge with Fiona Fang's figures and meanings. Fiona Fang's mathematical thought makes the structure (form and connotation) of mathematical formulas, laws, theorems and concepts popular, intuitive, universal and universal. For example, additive commutative law can be expressed as: square+circle = circle+square, which better reflects the meaning of this algorithm. Because in the current textbook: a+b=b+a, some students can't understand it as: (a+b)+c=c+(a+b). For example, let f(x+ 1)=2x+3, that is, f(x+ 1)=2(x+! )+1 is interpreted as f (circle) =2 circle+1, where: circle =x+ 1, that is, f(x)=2x+ 1, which better reflects its superiority.