题目内容
估算. 32×48≈ |
43×22≈ | 41×19≈ | 32×51≈ |
(1)32×48,
≈30×50,
=1500;
(2)43×22,
≈40×20,
=800;
(3)41×19,
≈40×20,
=800;
(4)32×51,
≈30×50,
=1500.
≈30×50,
=1500;
(2)43×22,
≈40×20,
=800;
(3)41×19,
≈40×20,
=800;
(4)32×51,
≈30×50,
=1500.
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