1、15x37简便方法：
=5 x 3 x 37
=3 x 37 x 5
=111 x 5
=555
2、15x37简便方法:
=(10 + 5) x 37
=10 x 37 + 5x37
=370 + 185
=555
3、15x37简便方法:
=(20 - 5) x 37
=20 x 37 - 5 x 37
=740 - 185
=555
4、15x37简便方法:
=15 x ( 40 - 3)
=15 x 40 - 15 x3
=600 - 45
=555
5、15x37简便方法:
=15 x (30 + 7)
=15 x 30 + 15 x 7
=450 + 105
=555
