99乘99加199怎样简便运算
问题描述:
99乘99加199怎样简便运算
答
99*99+198+1
=(99+1)(99+1)
=100*100
=10000
答
99*99+199=99*99+100+99=99*(1+99)+100=9900+100=10000
答
99乘99加199
=99×(100-1)+199
=9900-99+100+99
=10000