1.下列式子中屬于整式的是( ).A.x+yB.x2+3xy-y-1C.D.2.單項(xiàng)式5x2y,-2x2y,2xy2,-4x2y的和是 .3.當(dāng)x=,y=-2時(shí),代數(shù)式5x-(4y-3x)+2y的值是 .4.先化簡(jiǎn),再求值:x-(2x-y2)+(-x+y2),其中x=-2,y=-.5.計(jì)算:(-3a2)(5a2-a)= .6.化簡(jiǎn)(-a5)2+(-a2)5的結(jié)果是 (共 715 字) [閱讀本文] >>