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15问答网 > 用计算器计算，并找一找规律，再根据上面计算发现的规律直接写出下面两题的得数．（1）1+2+3+…+10=11+12

用计算器计算，并找一找规律，再根据上面计算发现的规律直接写出下面两题的得数．（1）1+2+3+…+10=11+12

2025-03-31 23:09:38

推荐回答（1个）

回答1：

（1）1+2+3+…+10=（1+10）×10÷2=55，
11+12+13+…+20=（11+20）×10÷2=155，
21+22+23+…+30=（21+30）×10÷2=255，
31+32+33+…+40=（31+40）×10÷2=355，
41+42+43+…+50=455，
51+52+53+…+60=555；

（2）33×34=1122，
333×334=111222，
3333×3334=11112222，
33333×33334=1111122222，
333333×333334=111111222222，
3333333×3333334=11111112222222．

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