4X5+5x4+5一9一7

4X5+5x4+5一9一7 求方程组x1+3x2+x3+2x4+4x5=3 2x1-x2+8x3+7x4+2x5=9 4x1+5x2+6x3+11x4+10x5=15的全部解线性代数 解方程组:x1+x2+x3+x4+x5=7 3x1+2x2+x3+x4-3x5=－2 x2+2x3+2x4+6x5=23 5x1+4x2-3x3+3x4-x5=10 1x1一2x2十3x3一4x4十5x5…十99x99一100x100 x1-x2+x3=1x2-x3+x4=21若x1,x2,x3,x4,x5满足方程组 x3-x4+x5=3x4-x5+x1=4x5-x1+x2=5求x2 x3 x4的值2已知 x1+x4+x6+x7=39 x2+x4+x5+x7=49 x3+x5+x6+x7=41 x4+x7=13 x5+x7=14 x6+x7=9 x1+x2+x3+x4+x5+x6+x7=9求x7的值若x1,x2,x3,x4,x5满足方程组 x1-x 在总体N(12,4)中随机抽一容量为5的样本X1,X2,X3,X4,X5.(1)求样本均值与总体均值之差的绝对值大于1的概率.(2)求概率P{max{ X1,X2,X3,X4,X5}>15}；P{min{ X1,X2,X3,X4,X5} 求解救!线性代数题啊《线性代数》2011年上半年第二次作业 一. 填空题（4x5=20分） 1.设向量组 线性相关,1、已知线性方程组 :2x1-x2+3x3-x4=1,3x1-2x2-2x3+3x4=3,x1-x2-5x3+4x4=2,7x1-5x2-9x3+10x4=8求：（1）对应 求解奇次线性方程组{上面2x1+x2+3x3+5x4-5x5 =0 中x1+x2+x3+4x4-3x5=0 下面3x1+x2+5x3+6x4-7x5=0 -3的2次方x5一(一2)的4次方x4 x1 + x2 + x3 + x4 + x5 = 7 4x1 + 2x2 + 3x3 + 2x4 - 2x5 = 5 x1 + 3x2 + 2x3 + 3x4 + 7x5 = 30求这方程组的通解 并指出它的一个特解x1 + x2 + x3 + x4 + x5 = 7 4x1 + 2x2 + 3x3 + 2x4 - 2x5 = 5 x1 + 3x2 + 2x3 + 3x4 + 7x5 = 30 matlab线性方程组计算X1+X2-5X3-X4+X5=98X1+5X2-X3+4X5=23X1-7X2-5X3-X4+X5=42X1+X2+8X3+3X4-X5=-86X2+2X3+7X4-2X5=15 (12-3/4)除以3 4 — 一又七分之二—5/72.5x4.8+5.2x5/2 46x2/45 求函数f(x)=x5一5x4+5x3+1在区间[-1,2]上的最值 练习一1．分解因式：(2)x10+x5-2；(4)(x5+x4+x3+x2+x+1)2-x5．2．分解因式：(1)x3+3x2-4；(2)x4-11x2y2+y2；(3)x3+9x2+26x+24；(4)x4-12x+323．3．分解因式：(1)(2x2-3x+1)2-22x2+33x-1；(2)x4+7x3+14x2+7x+1；(3)(x+y)3+2xy(1-x-y)-1；( X1 - X3 - X4 -5X5=0 X1+2X2+3X3+3X4+7X5=0 X1+X2+X3+X4+X5=0 X2+2X3+2X4+6X5=0 x1-x2+x3=1 x2-x3+x4=2 x3-x4+x5=3 x4-x5+x1=4 x5-x1+x2=5 求x1,x2,x3,x4,x5 (一1/6一3/20十4/5一7/12)x(一15x4) 1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9+9x10+10x11