共30题用时5分钟
10 × 9 =
3 × 8 =
18 + 53 =
400 × 8 =
900× 5 =
40 × 6 =
3×8+9=
9×2+4=
5×200=
3×7+4=
4×6+2=
5×9+6=
( )×5<37
100 ×4=
7×( )<43
2×9+5=
90×9=
2×8+6=
3×4+5=
2×7+8=
2×9+3=
900×3=
800×4=
4×400=
8×( )<65
( )×9<38
( )×9<64
( )×9<20
7×( )<50
6×( )<49