之前发的有些问题x4-5x2+44x4-65x2y2+16y4a6-7a3b3-8b66a4-5a3-4a24a6-37a4b2+9a2b4（x2-3）2-4x2x2（x-2）2-9（3x2+2x+1）2-（2x2+3x+3)2(x2+x)2+17(x2+x)+60(x2+xy+y2)(x2+xy+2y2)-12y4x2-2xy-3y2+2x+10y-8(a-b)x2+2ax+a+b在字母和括号后面的

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之前发的有些问题x4-5x2+44x4-65x2y2+16y4a6-7a3b3-8b66a4-5a3-4a24a6-37a4b2+9a2b4（x2-3）2-4x2x2（x-2）2-9（3x2+2x+1

之前发的有些问题x4-5x2+44x4-65x2y2+16y4a6-7a3b3-8b66a4-5a3-4a24a6-37a4b2+9a2b4（x2-3）2-4x2x2（x-2）2-9（3x2+2x+1）2-（2x2+3x+3)2(x2+x)2+17(x2+x)+60(x2+xy+y2)(x2+xy+2y2)-12y4x2-2xy-3y2+2x+10y-8(a-b)x2+2ax+a+b在字母和括号后面的
之前发的有些问题
x4-5x2+4
4x4-65x2y2+16y4
a6-7a3b3-8b6
6a4-5a3-4a2
4a6-37a4b2+9a2b4
（x2-3）2-4x2
x2（x-2）2-9
（3x2+2x+1）2-（2x2+3x+3)2
(x2+x)2+17(x2+x)+60
(x2+xy+y2)(x2+xy+2y2)-12y4
x2-2xy-3y2+2x+10y-8
(a-b)x2+2ax+a+b
在字母和括号后面的数字都代表指数,

之前发的有些问题x4-5x2+44x4-65x2y2+16y4a6-7a3b3-8b66a4-5a3-4a24a6-37a4b2+9a2b4（x2-3）2-4x2x2（x-2）2-9（3x2+2x+1）2-（2x2+3x+3)2(x2+x)2+17(x2+x)+60(x2+xy+y2)(x2+xy+2y2)-12y4x2-2xy-3y2+2x+10y-8(a-b)x2+2ax+a+b在字母和括号后面的
x^4 - 5x" + 4
= (x")" - x" - 4x" + 4
= x"( x" - 1 ) - 4( x" - 1 )
= ( x" - 1 )( x" - 4 )
= ( x - 1 )( x + 1 )( x - 2 )( x + 2 )
4x^4 - 65x"y" + 16y^4
= 4x^4 - x"y" - 64x"y" + 16y^4
= x"( 4x" - y" ) - 16y"( 4x" - y" )
= ( x" - 16y" )( 4x" - y" )
= ( x - 4y )( x + 4y )( 2x - y )( 2x + y )
a^6 - 7a"'b"' - 8b^6
= a^6 + a"'b"' - 8a"'b"' - 8b^6
= a"'( a"' + b"' ) - 8b"'( a"' + b"' )
= ( a"' + b"' )( a"' - 8b"' )
= ( a + b )( a" - ab + b" )( a - 2b )( a" + 2ab + 4b" )
= ( a + b )( a - 2b )( a" - ab + b" )( a" + 2ab + 4b" )
6(a^4) - 5a"' - 4a"
= a"( 6a" - 5a - 4 )
= a"( 6a" + 3a - 8a - 4 )
= a"[ 3a( 2a + 1 ) - 4( 2a + 1 ) ]
= a"( 2a + 1 )( 3a - 4 )
4(a^6) - 37(a^4)(b") + 9(a")(b^4)
= a"( 4a^4 - 37a"b" + 9b^4 )
= a"( 4a^4 - a"b" - 36a"b" + 9b^4 )
= a"[ a"( 4a" - b" ) - 9b"( 4a" - b" ) ]
= a"( a" - 9b" )( 4a" - b" )
= a"( a + 3b )( a - 3b )( 2a + b )( 2a - b )
( x" - 3 )" - 4x"
= ( x" - 3 )" - ( 2x )"
= ( x" + 2x - 3 )( x" - 2x - 3 )
= ( x" - x + 3x - 3 )( x" + x - 3x - 3 )
= [ x( x - 1 ) + 3( x - 1 ) ][ x( x + 1 ) - 3( x + 1 ) ]
= ( x - 1 )( x + 1 )( x - 3 )( x + 3 )
x"( x - 2 )" - 9
= x"( x - 2 )" - 3"
= ( x" - 2x + 3 )( x" - 2x - 3 )
= ( x" - 2x + 3 )( x" + x - 3x - 3 )
= ( x" - 2x + 1 + 2 )[ x( x + 1 ) - 3( x + 1 ) ]
= ( x + 1 )( x - 3 )[ ( x - 1 )" - ( √2i )" ]
= ( x + 1 )( x - 3 )( x - 1 - √2i )( x - 1 + √2i )
( 3x" + 2x + 1 )" - ( 2x" + 3x + 3 )"
= ( 3x" + 2x + 1 + 2x" + 3x + 3 )( 3x" + 2x + 1 - 2x" - 3x - 3 )
= ( 5x" + 5x + 4 )( x" - x - 2 )
= ( 1/20 )( 100x" + 100x + 80 )( x" + x - 2x - 2 )
= ( 1/20 )[ ( 10x )" + 10( 10x ) + 5" - 25 + 80 ][ x( x + 1 ) - 2( x + 1 ) ]
= ( 1/20 )( x + 1 )( x - 2 )[ ( 10x + 5 )" + 55 ]
= ( 1/20 )( x + 1 )( x - 2 )[ ( 10x + 5 )" - ( √55i )" ]
= ( 1/20 )( x + 1 )( x - 2 )( 10x + 5 + √55i )( 10x + 5 - √55i )
( x" + x )" + 17( x" + x ) + 60
= ( x" + x )" + 12( x" + x ) + 5( x" + x ) + 60
= ( x" + x )( x" + x + 12 ) + 5( x" + x + 12 )
= ( x" + x + 5 )( x" + x + 12 )
= ( 1/16 )( 4x" + 4x + 20 )( 4x" + 4x + 48 )
= ( 1/16 )[ ( 4x" + 4x + 1 ) + 19 ][ ( 4x" + 4x + 1 ) + 47 ]
= ( 1/16 )[ ( 2x + 1 )" - ( √19i )" ][ ( 2x + 1 )" - ( √47i )" ]
= ( 1/16 )( 2x + 1 - √19i )( 2x + 1 + √19i )( 2x + 1 - √47i )( 2x + 1 + √47i )
( x" + xy + y" )( x" + xy + 2y" ) - 12y^4
= ( x" + xy + y" )( x" + xy + y" + y" ) - 12y^4
= ( x" + xy + y" )" + y"( x" + xy + y" ) - 12y^4
= ( x" + xy + y" )" + 4y"( x" + xy + y" ) - 3y"( x" + xy + y" ) - 12y^4
= ( x" + xy + y" )( x" + xy + y" + 4y" ) - 3y"( x" + xy + y" + 4y" )
= ( x" + xy + y" - 3y" )( x" + xy + y" + 4y" )
= ( x" + xy - 2y" )( x" + xy + 5y" )
= ( x" + 2xy - xy - 2y" )( x" + xy + 5y" )
= [ x( x + 2y ) - y( x + 2y ) ]( x" + xy + 5y" )
= ( x - y )( x + 2y )( x" + xy + 5y" )
x" - 2xy - 3y" + 2x + 10y - 8
= ( x" - 2xy + y" ) - 4y" + ( 2x - 2y ) + 12y - 8
= [ ( x - y )" + 2( x - y ) + 1 ] - 4y" + 12y - 9
= [ ( x - y ) + 1 ]" - [ ( 2y )" - 6( 2y ) + 3" ]
= ( x - y + 1 )" - ( 2y - 3 )"
= ( x - y + 1 + 2y - 3 )( x - y + 1 - 2y + 3 )
= ( x + y - 2 )( x - 3y + 4 )
( a - b )x" + 2ax + a + b
= ax" + 2ax + a - bx" + b
= a( x" + 2x + 1 ) - b( x" - 1 )
= a( x + 1 )" - b( x - 1 )( x + 1 )
= ( x + 1 )[ ( ax + a ) - ( bx - b ) ]
= ( x + 1 )( ax - bx + a + b )

全部展开

x4-5x2+4=（x2-1）（x2-4）=（x+1）（x-1）（x+2）（x-2）
4x4-65x2y2+16y4=（2x2+4y2-9xy）（2x2+4y2+9xy）
a6-7a3b3-8b6=（a-2b）（a2+2ab+4b2）（a+b）（a2-ab+b2）
6a4-5a3-4a2=a2（2a+1）（3a-4）
4(a6) - 37(a4)(b2) + 9(a2)(b4)= a"( a + 3b )( a - 3b )( 2a + b )( 2a - b )
（x2-3）2-4x2=（X+1）（X-1）（X+3）（X-3）
x2（x-2）2-9=(X2-2X+3)(X+1)(X-3)
（3x2+2x+1）2-（2x2+3x+3)2=(X+1)(X-2)(5X2+5X+4)
(x2+x)2+17(x2+x)+60=(X2+X+5)(X2+X+12)
(x2+xy+y2)(x2+xy+2y2)-12y4=( x - y )( x + 2y )( x2 + xy + 5y2 )
x2-2xy-3y2+2x+10y-8=（x+y-2）（x-3y+4）
(a-b)x2+2ax+a+b=(X+1)((a-b）X+(a+b)）

收起

之前发的有些问题x4-5x2+44x4-65x2y2+16y4a6-7a3b3-8b66a4-5a3-4a24a6-37a4b2+9a2b4（x2-3）2-4x2x2（x-2）2-9（3x2+2x+1）2-（2x2+3x+3)2(x2+x)2+17(x2+x)+60(x2+xy+y2)(x2+xy+2y2)-12y4x2-2xy-3y2+2x+10y-8(a-b)x2+2ax+a+b在字母和括号后面的请指点一道解线性方程组的问题2x1+x2-5x3+x4=8x1-3x2-6x4=92x2-x3+2x4=-5x1+4x2-7x3+6x4=0 请教运筹学一道问答题.写出下列线性规划问题的对偶问题:max=2x1+3x2+5x3+7x4-x1+x2-x3-3x4=56x1+7x2+3x3-5x4≥8s.t.12x1-9x2-9x3+9x4≤20x1,x2≥0,x3≤0,x4无约束求下列线性规划问题的对偶规划 MAX S=X1+2X2+3X3+4X4① -X1+X2-X3-3X4=5② 6X1+7X2+3X3-5X4≥8③ 12X1-9X2-9X3+9X4≤20④ XI X2 X3≥0 X4无非负限制求下面线性规划问题的对偶问题maxZ=x1+x2+2x3+x42x1+3x2+x3-x4≤5x1-x2+6x3+x4≥7x1+x2= -4x1,x3≥0,x2≤0,x4无约束马上要考试落.求下面线性规划问题的对偶问题maxZ=x1+x2+2x3+x42x1+3x2+x3-x4≤5x1-x2+6x3+x4≥7x1+x2= -4x 求方程组通解,线性代数问题X1+X2-3X3-X4=13X1-X2-3X3+4X4=1X1+5X2-9X3-8X4=0X后面的全是下标, 运筹学……对偶问题.maxz=x1+2x2+3x3+4x4-x1+x2-x3-3x4=56x1-7x2+3x3-5x4 已知：x2-5x+1=0,求x4+1/x4的值求线性方程组（X1-X2+X4,X1-2X2+X3+4X4=3,2X1-3X2+X3+5X4=5)的一般解, 求解线性方程组的一般解方程组为 x1-x2+x4=2x1-2x2+x3+4x4=32x1-3x2+x3+5x4=5 求解非齐次线性方程组x1-2x2+x3+x4=1,x1-2x2+x3-x4=-1,x1-2x2+x3-5x4=5的解求齐次线性方程组X1+X2+2X2-X4=0,-X1-3X3+2X4=0,2X1+X2+5X3-3X4=0的一般解. 求非齐次线性方程组的基础解析X1+2X2+X3-X4=43X1+6X2-X3-3X4=85X1+10X2+X3-5X4=16 确定a的值,使线性方程组{X1+X2+X3+X4=1,3X1+2X2+X5+X4=0,X2+2X3+2X4=a,5X1+4X2+3X2+3X4=2 并求通解求下列齐次线性方程组的基础解系与通解.详见问题补充x1-2x2-x3-x4+x5=02x1+x2-x3+2x4-3x5=03x1-2x2-x3+x4-2x5=02x1-5x2+x3-2x4+2x5 一道用matlab求解的线性规划问题z=x1+x2+x3+x4+x5+x6+x7x1+x4+x5+x6+x7>=50x1+x2+x3+x6+x7>=50x1+x2+x3+x4+x7>=50x1+x2+x3+x4+x5>=80x2+x3+x4+x5+x6>=90x3+x4+x5+x6+x7>=90 已知x2/x4+1=1/3,求x4/x8+x4+1的值方程x4-5x2+6=0的根是?