问题
解答题
|
答案
(1)32×48,
≈30×50,
=1500;
(2)43×22,
≈40×20,
=800;
(3)41×19,
≈40×20,
=800;
(4)32×51,
≈30×50,
=1500.
|
(1)32×48,
≈30×50,
=1500;
(2)43×22,
≈40×20,
=800;
(3)41×19,
≈40×20,
=800;
(4)32×51,
≈30×50,
=1500.