3×4=
5×9=
2×7=
4×4+5=
9×1=
40+50=
8×6=
7×7-8=
6×9=
7×8=
60-6=
5×6-5=
补充条件:
解答:
□○□=□( )
34>5× ×8<45 -4<12
×7<56 31>6+ ×5<21
18:15和0.6:0.5 : 和 :2 0.4:0.8和0.5:0.2 16:8和1.2:0.6