1/25⑴(2x-1)(4x2+1)(2x+1);⑵(2a-b+3)(2a-3+b);⑶4(a+2)2-7(a+3)(a-3)+3(a-1)2.把下列各式因式分解:⑴-36x2+12xy-y2;⑵9(2a+3b)2-4(3a-2b)2;⑶(x2-2x)2+2(x2-2x)+1;先化简,再求值:2(x-y)2-(y-x)2-(x+y)(y-x),其中x=3,y=-2.2/25(1)66)34(375.0(2)2)21()3(20(3))12)(12(baba(4))31)(91)(31(22yxyxyx化简并求值(要看清楚哦!).22)())((2)(mnnmnmnm,其中2,2005nm3/25已知6)(,18)(22yxyx,求的值。及xyyx22102322334)()()(2aaaaa(1)(2)0422101010)101((3)4x(x-1)2+x(2x+5)(5-2x)(4)(a+3b-2c)(a-3b-2c)20.因式分解:9)(6)(2baba(1)(2)222yxxy4/25(3)42222)2(2)2(yxyxyxyx(2a-b)(a+2b)5/25(1)()32(103)+322-2-)()((2)23)3(a3a+(-4a)27a+(-5a3)3(3)(m+1)(m+2)(m-1)(m-2)(4)xyyxyx2)3()3(22.因式分解(1)22323642yxyxx(2)2732a(3)22)2()2(zyxzyx(4)48422axxa(1)3223)()(aa(2)543)()(ttt6/25(3)23)3()()3(aaa(4)022)14.3(3)2(4计算:20120113312.22.化简:3223332aaaa7/25化简求值:))(()2(2yxyxyx,其中21,2yx.阅读以下材料,解答问题:例:设162xxy,求y的最小值.解:162xxy=13332222??xx=10)3(2x 0)3(2x∴1010)3(2x即y的最小值是10.问题:(1)设542xxy,求y的最小值.(2)已知:054222bbaa,求ab的值.8/25(1)201010333525.0(2)2)12()1(5)23)(23(xxxxx,其中31x24、(本题8分,每题4分)因式分解:(1)1642x;(2)nmnnm121232先阅读后解题若m2+2m+n2-6n+10=0,求m和n的值解:等式的左边可变形为:m2+2m+1+n2-6n+9=0即(m+1)2+(n-3)2=0,因为(m+1)2≥0,(n-3)2≥0,所以m+1=0,n-3=0,即m=-1,n=3利用以上解法,解下列问题:已知0437622yxyx,求yx的值。若二次三项式422mxx是一个完全平方式,则m=.(1)0312011121(2)6)1)(1(2)1(2aaa9/25(3)233282(2)aaaaaa(4))1)(1(baba将下列各式因式分解:(1))()(2abbax(2)1642a(3)26xx(4)2224)1(xx先化简再求值(2a+b)2-(3a-b)2+5a(a-b),其中110a,15b.10/25(1)(-2011)0+(-3)2-()-1(2)m2·(-n)3·(mn)4(3)(x2+2x-1)(x-1)(4)(x-2y)2-(x+2y)(x-2y)19、分解因式:(1)362x(2)11nnxx(3)652xx(4)mmm352)2()]2(2)())([(2yyxyyxyxyx,其中x=5,y=2003(2))21)(121()121)(121(yxyxyxyx,其中x=1,y=2;4111/25(1)120211()(2)5()22(2)32(2)()(3)aaag2(21)(13)(31)xxx因式分解(1)2()16()axyyx(2)22222()4xyxy21.先化简,再求值:2()()()(2)abababaab,其中23a、112b12/25(1)02201120111123()()(4)24(2)102322334)()2()(2aaaaa;(3)2322233(2)()(3)xyxxyx(4))14)(12)(12(2xxx先化简,再求值(1)(x-2)2+2(x+2)(x-4)-(x-3)(x+3);其中x=-l(2))1)(2(2)3(3)2)(1(xxxxxx,其中31x.因式分解(1)babba6422(2)1164x13/25(3)22222()4xyxy(4)16)5(8)5(222xx(1)若3x=4,3y=6,求92x-y+27x-y的值.(2)若26=a2=4b,求a+b值(1)x(2x-y)-(x+2y)(x-y)(2)bababa2345452(3))2)(2(282xxx—8(4)(a+3b-2c)(a-3b-2c)(5)(x+y-3)(x-y+3)(6)1)4)(2(xx14/25(7)(-3)0-(12)-1+2008200921.53(8)4x(x-1)2-x(2x+5)(5-2x)(9)(2m+3n)2·(3n-2m)2(10)3232yxyx30先化简,再求值:2)12()1(5)23)(23(xxxxx,其中31x31.因式分解(1)a2(x-y)+b2(y-x)(2)2222221xxxx(3)22254abab(4)x3-2x2+x(5)(+2)(+4)yy+1;(6)x4+6415/2532)().1(ttt23)3()()2().2(aaa?)4()()3().3(322xyxyxy?)1)(1().4(2xxx2)2()2)(2().5(yxyxyx)2)(2().6(cbacba1.44yx2.22216)4(xx16/253.aaa36323若221624bkaba是完全平方式,那么k的值是()A.16B16C.8D.8(1))21)(3(yxyx(2))32)(32(42xxx22.分解因式:(1))()(2abbax(2)42222)2(2)2(yxyxyxyx17/251.解方程组:.2.解方程组.3.用指定的方法解下列方程组:(1)(代入法)(2)(加减法)(2)解方程组.5.解下列方程组:(1)(2).(2)解方程组:.18/257.解方程组.8.解方程组:9.解方程组.10.解方程组.11.解方程组:.12.解...