七年級數(shù)學(xué)上冊 第三章 整式及其加減 3.3 整式課件 （新版）北師大版.ppt

3整式,1.表示數(shù)與字母的的代數(shù)式叫單項(xiàng)式,單獨(dú)一個(gè)或一個(gè)也是單項(xiàng)式.單項(xiàng)式中的因數(shù)叫做這個(gè)單項(xiàng)式的系數(shù).所有字母的叫做這個(gè)單項(xiàng)式的次數(shù).2.請你寫出一個(gè)單項(xiàng)式:,它的系數(shù)是,次數(shù)是.3.幾個(gè)單項(xiàng)式的叫做多項(xiàng)式.多項(xiàng)式中,每個(gè)單項(xiàng)式叫做多項(xiàng)式的;一個(gè)多項(xiàng)式中,次數(shù)的次數(shù),叫做這個(gè)多項(xiàng)式的次數(shù).4.多項(xiàng)式5x-4xy2+3是次項(xiàng)式,最高次項(xiàng)是.5.單項(xiàng)式和多項(xiàng)式統(tǒng)稱.,乘積,數(shù),字母,數(shù)字,指數(shù)和,3,和,項(xiàng),最高的項(xiàng),三,三,-4xy2,整式,1,2,3,4,5,6,答案,1.(2017山東青島四模)下列式子:中,整式的個(gè)數(shù)是().A.6B.5C.4D.3,1,2,3,4,5,6,答案,2.(2017貴州銅仁中考)單項(xiàng)式2xy3的次數(shù)是().A.1B.2C.3D.4,1,2,3,4,5,6,答案,3.多項(xiàng)式1+xy-xy2的次數(shù)及最高次項(xiàng)的系數(shù)分別是().A.2,1B.2,-1C.3,-1D.5,-1,1,2,3,4,5,6,答案,1,2,3,4,5,6,答案,5.多項(xiàng)式2x2-3x+5是次項(xiàng)式.,1,2,3,4,5,6,(1)該多項(xiàng)式是幾項(xiàng)式?(2)寫出它的各項(xiàng).(3)寫出它的最高次項(xiàng).(4)寫出最高次項(xiàng)的次數(shù).(5)寫出多項(xiàng)式的次數(shù).,答案,