I think only use examples: 5-3=2,7-3=4,11-7=4,...,2m+1-(2n+1)=2(m+n)...It is not easy to teach,good lucky.
I think only use examples: 5-3=2,7-3=4,11-7=4,...,2m+1-(2n+1)=2(m+n)...It is not easy to teach,good lucky.
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