a) 3x0 = 310,320,330,340, 350,360,370,380,390
b) 5aa =500,511,522,533,544,555,566,577,588,599
c) 637x =6370,6371,6372,6373,6374,6375,6376,6377,6378,6379
d) xx4 =114,224,334,444,554,664,774,884,994
e) x33 =133,233,333,433,533,633,733,833,933
f) 2xx5 =2005,2115,2225,2335,2445,2555,2665,2775,2885,2995
g) 7xy =701,710,712,721,723,732,734,743,745,754,756,765,767,776,778,787,789,798,790,709
