问题
解答题
估算下面各题
|
答案
①53×101,
≈50×100,
=5000;
②9×398,
≈9×400,
=3600;
③198×39,
≈200×40,
=8000;
④99×21,
≈100×20,
=2000.
估算下面各题
|
①53×101,
≈50×100,
=5000;
②9×398,
≈9×400,
=3600;
③198×39,
≈200×40,
=8000;
④99×21,
≈100×20,
=2000.