23 ×15=
0.324÷0.01=
4÷ 49 =
109 ×1 45 =
0× 23 ÷3=
3.2x﹣1.9x=
2a+1.5a=
24×4%=
1.25×25×8×0.4=
( 23 ﹣ 19 )×18=
凑5