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(n+m)+k=n+(m+k)is called ______ of addition

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n+m=m+n is called ______ of addition.

Natural number is the number of elements in a ______ set.

The connotation of data analysis is to obtain useful information from data and form knowledge. Is this statement correct?

The connotation of intuitive imagination is to perceive the shape and change of things with the help of spatial imagination, and to understand and solve mathematical problems by using geometric figures. Is this statement correct?

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