Question

99×99+199用简便方法怎么做？

Answer 1

100乘99减99加199

Answer 2

99×99+199
=99×（100-1）+199
=99×100-99×1+199
=9900+199-99
10000

Answer 3

99×99+199
=99×（100-1）+199
=9900-99+199
=9900+100
=10000

Answer 4

=99*99+100+99*1=99*(99+1)+100=99*100+1*100=(99+1)*100=100*100

Answer 5

=99×99+99+100=99×（1+99）+100=9900+100=10000