17500m²=hm² 2.05km²=hm²
6.9÷0.016.9×100 4.8÷1.24.8
12.3×1.0112.3 0.31÷3
①6.6÷0.6= ②1.8×0.2= ③0.48÷0.6= ④3.46+2.54=
⑤1÷0.25= ⑥2-1.7= ⑦0.8×10.1= ⑧2.4×0.5=
①80-(8.8+1.2)×1.4
②86.4÷0.24×0.25
③(455-12.5×4)÷0.81
④12.3-12.3×0.9
⑤12.6÷[3.5-(9.8-8.7)]
⑥1.08÷[(0.4+0.5)×0.6]