正在加载图片...
{○，O,○， ●，●，●，O, ○，○，○，○，○} (1+x+x2+x3) (1+x+x2+x3+x4) (1+x+x2+x3+x4+x5) 三 1+3+6x2+10x3+14x4+17x5+18x6 +17x7+14x8+10x9+6x10+3x11+x12(1 + x + x2 + x3) (1 + x + x2 + x3 + x4) (1 + x + x2 + x3 + x4 + x5) { } , , , , , , , , , , , = 1+3+6x2 + 10x3 + 14x4 + 17x5 + 18x6 +17x7 + 14x8 + 10x9 + 6x10 + 3x11 + x12