98分之95乘99用简便运算
问题描述:
98分之95乘99用简便运算
急用啊
答
95/98 * 99
=(98-3)(98+1)/98
=(98^2 - 2*98 -3)/98
=98-2- 3/98
=96 - 3/98
=95 + (1-3/98)
=95+95/98
=95又98分之95