练习一:CCACCBDB30,3或44和616:25:088052号
练习二:ACDCCB4,等边三角形8210560°110°
练习三:CBDCCABB⑷⑹⑺⑴⑵⑶⑸±2/30.69.75×10^105或√7直角10
练习四;BCDDDADB-1/2±3-√5√3-√22.0310035;815(√就是根号。)
练习五:CBCDDCCCC90一、口、王、田经过□ABCD的对角线交点AC=BD且AC⊥BD22cm与20cm6345°8
练习六:BCABDACD线段、平行四边形、正方形、园线段、角、正方形、等腰梯形、圆、等边三角形线段、正方形、圆90AB=CD80228
练习七:BCAAAA有序实数对133(-3,-1)=3≠-2(1,2)(1,-3)(-3,-7)
练习八:BCACBC(3,0)(0,1)(-6/7,9/7)y=x 3s=264-24t-2-1y=x-3y=1/3x-1/358240
练习九:CBBDCC-19/2y=3x 51433三y=-x-1一、二、四减小xy8x=2,y=7(自己用大括号)512015
练习十:ADDB9520310188.1993m 73n 7
练习十一:ADBBCDCB2-2325/84(4,-3)y=-5/2xx=-1,y=2(自己用大括号)9±6