(1)在长线段内增加三个点变成下面图形,数一数,一共有6N4X3c/b线段。'd/v8y(h7p;g8a-h+l6B6Q)R9n,M7w
(2)如果线段内增加了9个点,有'n4K9o'q,e1W-F6H条线段。'd/v8y(h7p;g8a-h+l6B6Q)R9n,M7w
'd/v8y(h7p;g8a-h+l6B6Q)R9n,M7w