19届初三数学第一次诊断考试试卷

201930120192.7660A.1.78107B.1.78106C.1.8107D.1.810623a2+4a2=7a43a2-4a2=-a24a2-a2=43a5a=15a12a34a3=3A1B2C3D43ABCC=90sinA=32tanB=A53B25C552D354100Asin100B100sinCcos100D100cos5.O1O26cm3cm0201=8cmABCD6ABCDEBCAD1DB2ABCADESS()A41B91C31D217y=2x2+4x+643Ay=2x52-7By=2x321Cy=2x42+3Dy=2x52-18()A7B9C11D-1190aaxy2axy10abckcbabcaacby=kx-k=0,c12x3-4x=13sin20=cos+250tan=14-2-10125xx2-x+K=0K15x=1y=16a1743182ykxbyxb612xyykxb31b19y=mx2-4x+1-3m20y=ax2-2x+3xa6021612110118(1)2cos454+0.252019(-42019)2aaaaaa11211221a2210A6yxOA4AACx,COAOCBABCx15xyy=x-5y=x2+1xxaxx4242310OABCBAC45ABC15ADOCBCDOCABE(1)D(2)AC2AD?CE2410POPAOAOPCBAPOOA=4PA=341POA2AB32510ACBCFB30020EB600BC.()ACEFB268532123027154700ABC10020AxByxyCyx200P()x()C()405550()5080652815,221xyyXABcbxxy2AB12xx=tABMNtMN32AMNDDNMOBAyx