1x2x3 3x6x9 7x14x21/1x4x5 3x12x15 7x28x35?简算

求下列方程组的通解:{x1+x2+x3+x4+x5=7;3x1+x2+2x3+x4-3x5=-2;2x2+x3+2x4+6x5=23_百度知道
求下列方程组的通解:{x1+x2+x3+x4+x5=7;3x1+x2+2x3+x4-3x5=-2;2x2+x3+2x4+6x5=23
  解:  x1+x2+
x5=7  3x1+x2+2x3+
x4- 3x5=-2  2x2+
x3+2x4+6x5=23  1
1  系数矩阵A=
7  增广矩阵B=(A,b)= 3
23   r2-3r1得  1
23  r3+r2得  1
0  -(1/2) r2得  1
0  r1-r2得  1
0  所以方程组的通解为x1=-9/2-x3/2+2x5  x2=23/2-x3/2-x4-3x5【x3,x4,x5为任意实数】
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出门在外也不愁利用matlab求解88.5=&3x1+3.5x2+4x3+4.5x4+5x5+5.5x6+6x7+6.5x8&=89.5; 19=&x1+x2+x3+x4+x5+x6+x7+x8&=20_百度知道
利用matlab求解88.5=&3x1+3.5x2+4x3+4.5x4+5x5+5.5x6+6x7+6.5x8&=89.5; 19=&x1+x2+x3+x4+x5+x6+x7+x8&=20
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matlab 里面没有用来专门解不等式的函数,,解一般的不等式方程我们通常是在maltab里绘出图形,,找交点,,然后再判断。。哈哈举个例子给你:解9*x+4&=1,,x^3-2*x+2&=7这个不等式组x=0:5;ezplot('9.*x+3')hold onezplot('x.^3-2.*x-5')hold off根据图片的几个区间能判断出来解,,当然,,这只能用来解简单的不等式,,复杂点的matlab可以用优化去解,,像你这个解不了,,优化要有目标函数,,你这个好像没有,呵,建议可以去看下matlab优化函数。。
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出门在外也不愁如果一组数据x1x2x3x4x5的平均数是x则另一组数据x1x2+1x3+2x4+3x5+4的平均数是_百度知道
如果一组数据x1x2x3x4x5的平均数是x则另一组数据x1x2+1x3+2x4+3x5+4的平均数是
如果一组数据x1x2x3x4x5的平均数是x则另一组数据x1x2+1x3+2x4+3x5+4的平均数是
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根据已知,x1+x2+x3+x4+x5=5x ,所以,由 x1+(x2+1)+(x3+2)+(x4+3)+(x5+4)=(x1+x2+x3+x4+x5)+10=5x+10 得平均数为(5x+10)/5=x+2 。
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All Rights Reserved求非其次线性方程组 {x1+2x2+x3+x4+x5=1x1+2x2+x3+x4+x5=12x1+4x2+3x3+x4+x5=2-x1-2x2+x3+3x4-x5=5
2x3+4x4-2x5=6
的一般解_作业帮
求非其次线性方程组 {x1+2x2+x3+x4+x5=1x1+2x2+x3+x4+x5=12x1+4x2+3x3+x4+x5=2-x1-2x2+x3+3x4-x5=5
2x3+4x4-2x5=6
求非其次线性方程组 {x1+2x2+x3+x4+x5=1x1+2x2+x3+x4+x5=12x1+4x2+3x3+x4+x5=2-x1-2x2+x3+3x4-x5=5
2x3+4x4-2x5=6
写出此方程组的增广矩阵,用初等行变换来解1 2 1 1 1 12 4 3 1 1 2-1 -2 1 3 -1 50 0 2 4 -2 6 第2行减去第1行×2,第3行加上第1行1 2 1 1 1 10 0 1 -1 -1 00 0 2 4 0 60 0 2 4 -2 6 第1行减去第2行,第3行减去第4行,第4行除以21 2 0 2 2 10 0 1 -1 -1 00 0 0 0 2 00 0 1 2 -1 3 第1行减去第3行,第3行除以2,第4行减去第2行1 2 0 2 2 10 0 1 -1 -1 00 0 0 0 1 00 0 0 3 2 3 第1行减去第3行×2,第2行加上第3行,第4行减去第3行乘以2,第4行除以31 2 0 2 0 10 0 1 -1 0 00 0 0 0 1 00 0 0 1 0 1 第1行减去第4行乘以2,第2行加上第4行,第3行和第4行交换1 2 0 0 0 -10 0 1 0 0 10 0 0 1 0 10 0 0 0 1 0所以得到非其次线性方程组的特解为:x1=-1,x2=0,x3=1,x4=1,x5=0而对应的齐次方程通解为c*(-2,1,0,0,0)^T所以此非其次线性方程组的解为:c*(-2,1,0,0,0)^T + (-1,0,1,1,0)^T c为常数
x1+2x2+x3+x4+x5=1
2x1+4x2+3x3+x4+x5=2
x1+2x2+2x3=1
三x1+2x2+x3=1-x3
四把四代入三有 x3=x4+x5
消去x3得 1=x2+x
然后就能解了
k(2,-1,0,0,0) (0,0,1,1,0)

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