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小学三年级奥数50题及答案解析,期末提分准备
2026-08-17
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Key Point:从头数,她站在第5个位置,说明她前面有5-1=4个人,从后数她站在第3个位置,说明她后面有3-1=2人,所以这一行的人数为4+2+1=7人,所以这个班的人数为7×6=42人。
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