100以内的连减题
解ï¼
1+2+3+4+5+........+100
=[(1+100)*100]/2
=101*100/2
=10100/2
=5050
å ¬å¼ï¼è¿ç»èªç¶æ°ç¸å =ï¼å¤´+å°¾ï¼*个æ°/2
1+2+3+4+5+........+100
=[(1+100)*100]/2
=101*100/2
=10100/2
=5050
å ¬å¼ï¼è¿ç»èªç¶æ°ç¸å =ï¼å¤´+å°¾ï¼*个æ°/2
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