中考數(shù)學(xué)模擬卷 (含答案)

中考數(shù)學(xué)模擬卷A3）B．2(x0)y）x2(xyx．1）2122332231，232A=，12）2222222x222x222222m3n8mn()n8338m3∵＝，8n3＝，838n+n11＝∴＝．n8n．）ABC1）0.10.20.30.4335，263A或BA或BCD為OCD于CD）寸寸寸寸CDOC，CDOABCD于11＝＝22OAOAxx，222．a(chǎn)xbxcxyy2xyaxbxc21為xy隨x）212x而x隨xDxxx42x1xx22x1x2xxxm02x2把∴2xx20x12，61)﹣312333326x3x1＞，xx21.3226x3x1＞①xx2，②32．xx-6x+9x-32?-．x2x-1x-12x+13,323.x1xx6x9x32，x1x1x12x32xx1·，x1x1x1x3xx33．x1x1x133323.當(dāng)2xx11211202001AECAEBD為AEAE(1243)作CFCABFCDBFCFDB12在RtVACFACFtanAF121在ECFtanEF3123EF43AEAFEF12434312AExk1是FxFE沿CG4y.38x是32kx326，xk4k=4k4k3kk=3，343在，kk4，3E作于，43∴∴，343，9，4在，222kk））=8116，224421，8．8xABOACOOABO，交ACBCG是EFCGCGOOB；2DCEDECGOCGOCE，ABOACBACFG是EF，AEOGECGCE，，OCAOAC，，OACAEOOCAGCEOCGC，CGOAOEFCEAEOFEC，OAE，，ABCFBO，∴BF，BO，OBBCBF；2GCGE，GCF，EGC，DCE，EGCDCE，DECCEG，ECDEGC，∴，DG3∴，3DEDE2或故DEB4a22b6,∵ab)a2abb36,∴(a222∴ab2223mx無x2x4x22解或或23或x2x2x4x2CB43或4.，222；84=4322.43或3或ABOB3ABOAAyABOABOAx11131111123OOyABx1233A8636．A（AA（624點(diǎn)A8ABCDFCDEAFAFBDAEF11BAE＝DAF＝S23AAH=AFEAHEAFAEAE中，過A作于ABEAGEAEBABG中，AEAEA12，設(shè)，222，2222323mDF1∴tanDAFAD2m3設(shè)，222，22165∴S2VAEF33161＝26W最大值3yx，kb212∴，8kb91212當(dāng)611x，222b當(dāng)2a1Wx2211x2223ABCD為DE//AB交EDDFCFADAE與FCACFRtABCABC90D為DE//AB，交EABCBC:ABmD為D作DE//AB交EADFACFABC時(shí)AEFC1FCAE，3.mD33∵BC:AB=m1mxD在yODPtCDBPS與tSQBCCDP點(diǎn)P3②3171，）228223171，）222P作設(shè)22211＝S2211即S＝，3322222832