Question

178×99+78的简便计算？

Answer 1

=（100+78）x99+78
=100x99+78x（99+1）
=9900+7800
=17700

Answer 2

178X99+78=178x(100-1)+78=178X100—178+78
=17800—(178-78
=17800—100=17700

Answer 3

178×99+78
=100×99+78×99+78
=9900+78×100
=9900+7800
=17700

Answer 4

＝178×100-178+78＝17800-100＝17700

Answer 5

178*99+178
=178*(99+1)
=178*100=17800