问题
解答题
估算下面各题.
89×102≈
139×38≈
107×42≈
41×198≈
61×98≈
49×102≈
答案
89×102≈9000;
139×38≈4000;
107×42≈4000;
41×198≈8000;
61×98≈6000;
49×102≈5000;
故答案为:9000;4000;4000;8000;6000;5000.
估算下面各题.
89×102≈
139×38≈
107×42≈
41×198≈
61×98≈
49×102≈
89×102≈9000;
139×38≈4000;
107×42≈4000;
41×198≈8000;
61×98≈6000;
49×102≈5000;
故答案为:9000;4000;4000;8000;6000;5000.