1) 估一估，选择合理的答案。 a) 大约200枚 b) 大约400枚 2) 估一估，选择合理的答案。 a) 少于500枚 b) 多于500枚 3) 520，527，__________, 541, 548 a) 541 b) 534 c) 536 4) 379, 384, 389, 394, __________ a) 399 b) 389 c) 379 5) 723, __________, 707, 699, 691 a) 713 b) 714 c) 715 6) 546, _________, 746, 846, 946 a) 646 b) 636 c) 626 7) 127, 137, 147, 157, __________ a) 167 b) 177 c) 187 8) 874, 871, __________, 865, 862 a) 872 b) 868 c) 864
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二年级数学 数列以及估算
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数学
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