(697*285+286)/(286*697-411)如何简算?

问题描述:

(697*285+286)/(286*697-411)如何简算?

(697*285+286)/(286*697-411)
=(697*285+286)/[(285+1)*697-411]
=(697*285+286)/(697*285+1*697-411)
=(697*285+286)/(697*285+286)
=1