【導(dǎo)讀】的系數(shù)是_________,次數(shù)是_________.a·5%萬元%a萬元C.a萬元D.2a. ⑵多項(xiàng)式除以單項(xiàng)式的法則:先把這個(gè)多項(xiàng)式的每一項(xiàng)分別除以______________,再把所得的商_________.。在④和⑤后面的橫線上分別寫出相應(yīng)的等式;10.觀察下面的單項(xiàng)式:x,-2x2,4x3,-8x4,…根據(jù)你發(fā)現(xiàn)的規(guī)律,寫出第7個(gè)式子____.