×3÷×3 25×7×434÷4÷1.7 1.25÷×0.8
估算.3.5×9.9≈ 33÷7.9≈ 62.9÷7.01≈ 4.03×2.9≈
估算.302×4≈ 59×7≈ 199×5≈
估算下面各题.298×9≈ 408÷52≈ 638÷69≈ 98×42≈
估算319×6≈ 53÷6≈ 397+501≈ 287×9≈
估算14.1÷0.71≈ 3.15÷4.9≈ 2.99×1.02≈ 3.01×1.5≈