题目内容
估算.
| 151×29≈ | 813×89≈ | 70×301≈ | 69×402≈ |
151×29,
≈150×30,
=4500;
813×89,
≈810×90,
=72900;
70×301,
≈70×300,
=21000;
69×402,
≈70×400,
=28000.
≈150×30,
=4500;
813×89,
≈810×90,
=72900;
70×301,
≈70×300,
=21000;
69×402,
≈70×400,
=28000.
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