A:AaXBY和AAXBX
B:AaXBY和AaXBXb;
C:AaXBY和AaXBXB
D:aaXbY和AaXBXb
12 ﹣ 14 =
35 × 13 =
0.25÷ 14 =
3+ 13 ÷ 13 =
1﹣15%=
10÷0.1=
1000﹣405=
40×20%=