已知等差数列的第一项是12,第六项是27,求公差?9~9I-e/J,W4P,d)X2R)]2F
算式:提示.d1H/b+^0}6D9U2i9~9I-e/J,W4P,d)X2R)]2F
答:公差是*W*g8Y;g6X2r'i:y8?*m。9~9I-e/J,W4P,d)X2R)]2F