A:MgSO4
B:KAl(SO4)2
C:Al2(SO4)3
D:NaAlO2
已知甲数为a×10n,乙数是甲数的10倍,丙数是乙数的2倍,甲、乙、丙三数的积为1.6×1012,求a,n的值.(其中1≤a≤10,n为正整数)
When I got to school, I realized I ______ my backpack at home.