5.3×1.25.3 5.43×0.99 5. 43 4.84×0.90.9
2.5×20=
9.7-7=
91÷1000=
1-0.37=
125×0.08=
0.5+1.04=
65.8×100=
2.6吨+400千克=
够□ 不够□