(填“够”或“不够”)
×4<25
6×<19
70>8×
5×<27
36>8×
×6<25
×=×=36
28>×6 ×9<60
65>8× 7×<50
5×6=
7×8=
3×4=
6×7=
58+23=
5×9=
72-34=
37+15=
88-56=
99-19=
21+34=
54+6+38=