计算题(1)2222×0.17+33.33×4+666.6×0.9(2)1.4477÷0.0031-19.816×10.25+36.114
估算.401×5≈ 196×8≈ 809÷90≈ 5603÷700≈
估算:391×3≈512×7≈
估算下面各题.(1)722÷90≈ (2)361÷59≈ (3)208×29≈ (4)49×79≈
估算.395×23≈581×57≈484÷58≈558÷83≈
估一估.11×8≈ 38×6≈ 58×7≈ 82×3≈289×4≈ 602×6≈ 509×8≈ 511×4≈