人教版九年级上册数学一元二次方程知识点归纳及练习

1()2()2)0(02acbxax2axabxbc----1()2x2=bbax2)(axb0bbaxbaxb03222)(2bababaaxx222)(2bxbbxx()24)0(02acbxax)04(2422acbaacbbxacb420acb42=0acb420500)0(02acbxaxacb42)0(02acbxaxacb42)0(02acbxax21xx)04(2422acbaacbbxabxx21acxx2153012x90Ax=3Bx=-2Cx=4.5D3x224xx4xB2xC4x0xD0x3A238xxB2510xxC271470xxD2753xxx42221xxxx2yxxA210yyB210yyC210yyD210yy5ab220090xx22aabA2006B2007C2008D200962007300020095000xA23000(1)5000xB230005000xC23000(1)5000xD23000(1)3000(1)5000xx530702xx8x2(3)0xkxk2______9x220xxmm10n0nx220xmxnm+n____________112730xx1x2x12xx12xx12H1N1169x____________84013(x-3)2=(x-3)142x2-4x+1=01530816xx2-(m+1)x+m+4=02m17202020002120012020