最新人教版八年级下册数学知识点总结归纳

1.aa02.3.4.11a2=aa02aa25.1?23ab=aba0b0bbaab0a04?aa0aa00a=01.abccba2221ABC90C22cab22bca22acb22a,b,ccba222abc222abcabc222acbabcb3222abcabcabc3,4,56,8,105,12,137,24,254.1C=90A+B=90230A=30BC=21ABC=903ACB=90CD=21AB=BD=ADDAB5AB.CD=AC.BC6127121234581122123.4567123113602360.21n(n-2)1802360.12S==ah333123321ABCD.123ADBCADBCOCDBAOABDOC321ABCD.123321ABCD.(.:DEABCDEBCDE=21BCABCDa,bS=abABCDahS=ahb,cS=bc21ABCDaaS2bbS22114.15.CDABEDCBA.1.2.3.1S=ab=ch.ab,chc2S=ah.aha3S=a+bh=Lh.abh,L1n.2.3.4...,,xyxyxyx120345123123y=kx(kk0).ky=kx+b(k,bk0).b=0,y=kx+by=kx,.1):y=kx(kk0))y=kx(2):k0,y=kxxyk0,y=kx,xy:1.xy=ax+b02.ax+b=0(a,ba0)y=ax+bx3.ax+b0(aba0)xy=ax+b04.ax+b0(aba0)y=ax+bxy=kx+bkbk0yx.b=0y=kxk0.k0yx()()k0yx()().y=kx+bk0kb.1k0b02k0b03k0b04k0b05k0b06k0b0y=kx+bkbk0y=kxk0.:1.xy=ax+b02.ax+b=0(a,ba0)y=ax+bx3.ax+b0(aba0)xy=ax+b04.ax+b0(aba0)y=ax+bxy=kx+bkbkyx.b=0y=kxk.k0yx()()k0yx()().y=kx+bkkb.1k0b02k0b03k0b04k0b05k0b06k0b0y=kx+bkbky=kxk.15:()()=-s2.:s4.5.s2=[(x1-)2+(x2-)2++(xn-)2]