( 1 )乘以( 3 )乘以( 5 )=15
( 1 )乘以( 2 )乘以( 11 )=22
( 2 )乘以( 3 )乘以( 7 )=42
( 2 )乘以( 5 )乘以( 5 )=50
( 3 )乘以( 3 )乘以( 7 )=63