→ nonumber :5. 12>6>3>2>1 10>5>3>2>1 8>4>2>1 4+4+3=11 06/29 15:06
→ nonumber :4. 28907=137x211 10001=137x73 max=211x47=9917 06/29 15:11
→ nonumber :2. (x+2p,y+2q),(x+2p+1,y+2q),(x+2p,y+2q+1), 06/29 15:35
→ nonumber : (x+2p+1,y+2q+1) 必有兩點同時在某集合 06/29 15:36
→ nonumber :3. (x,y)€(+,-) 2k-1<0,k+2>0 -2<k<1/2 06/29 15:39
推 woieyufan :1. (50+50+20*n)*n/2+(50+20*n+50+20*n-15*(30-n))* 06/29 16:49
→ woieyufan :(30-n)/2=7470 06/29 16:49
→ woieyufan :兩個梯形公式而已.... 06/29 16:50