题目内容
| 估算. 0.59×2.8 | 12.7×1.99 | 4.01×6.3 |
| 7.01×3.98 | 6.9×5.5 | 9.1×10.01. |
0.59×2.8≈0.6×3=1.8;
12.7×1.99≈13×2=26;
4.01×6.3≈4×6=24;
7.01×3.98≈7×4=28;
6.9×5.5≈7×5.5=38.5;
9.1×10.01≈9×10=90.
12.7×1.99≈13×2=26;
4.01×6.3≈4×6=24;
7.01×3.98≈7×4=28;
6.9×5.5≈7×5.5=38.5;
9.1×10.01≈9×10=90.
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