八年级数学下册知识点总结(全)

1xyxyxyx2312xy341231bkxykbk0yxbkxyb0kxykk0yx23bkxy0bkxy004.kxy1k0yx2k0yx5bkxy1k0yx2k0yx6kxyk0kbkxyk0kbkbk0b0y0xyxb0y0xyxK0b0y0xyxb0y0xyxb=0113602360.21n(n-2)1802360.3ABCD.543214.ABCD54321.5.ABCD.3;2;16.321ABCD.ABCD1234ABCDABDOCABDOCADBCADBCADBCOADBCO7ABCD.3218321ABCD.9ABCD.321CDAB1ABCDO2310321ABCD.(3)ABCDAD=ABABCD11ABCD.32112CDBAOCDBAOABCDOCDAB321ABCD(3)ABCDADBCAC=BDABCD14.15..1.2.3.1S=21ab=ch.ab,chc2S=ah.aha3S=21a+bh=Lh.abh,L1n2)3n(n.2.3.4,,,,,,..EFDABCEDCBAABCDO5ABEFDECABDCABDCABDCEFFABDCABDCABDCABDCGFEEEE1.2.1.1802.1803.1.2.3./102cbxaxa,b,c0a02cbxax2axbxcab123042.10a232)0(2mmx102cbxax)0(a)04(2422acbaacbbx02cbxax)0(acba,,acb42042acbba,acb4202cbxax)0(a00BA0A0B0.034acb42=acb4202cbxax)0(a0=0005=1+nn=1-nnV3V12=1nxxxx,,,,3,21x2s];)()()[(1222212xxxxxxnsn2];)()()[(1222212xxxxxxnsn])[(12222212xnxxxnsn2222212)(1xxxxnsn3''2'1,,nxxx,2'snxxxx,,,,3,212saniaxxii,,2,1,'22'ss41222211xxxxxxnn2312s22s1.2=/1.