6. 设 求此向量组的秩和一个极大无关组,并将其余向量用该极大无关组线性表示.

(a1,a2,a3,a4)=12351246r2-r112350011r2-3r212020011所以a1,a3是A的一个极大无关组a2=2a1,a4=2a1+a3

(a1,a2,a3,a4,a5)=1114-31-13-2-12135-53156-7r4-r31114-31-13-2-12135-51021-2r1-r4,r2-r4,r3-2r401-13-10

秩即非零行行数,为3.极大无关组a1,a2,a4.a3=3a1+a2,a5=2a1+a2.

解:(a4,a2,a1,a3)=[注意调换了向量的顺序]-1111012101322141r4+2r1-1111012101320363r1-r2,r3-r2,r4-3r2-10-1001210011

(α1,α2,α3,α4)=6117404112-9093-6-12-4223r5+2r3,r4-r1-r3,r3-2r161174041-110-11-14202-84043r1-3r4,r2-2r

令A=（a1,a2,a3,a4）做行变换,化为阶梯矩阵,然后直接写出秩和极大无关组再问：方法我知道，我想要具体的计算过程，因为怎么算都跟答案不符再答：根据题意的到A=（12020-4-4-20k+25

请及时采纳

A=(a1,a2,a3,a4)=[12-13][0101][1101][0202]行初等变换为[1101][01-12][0101][0202]行初等变换为[1101][01-12][001-1][0

(a1^T,a2^T,a3^T,a4^T)=1320-222220-31-1-4-41r2+r3,r3-2r1,r4+r1132002-130-6-710-1-21r3+3r2,r2+2r413200

(a1,a2,a3,a4,a5)=1-2-102-2426-62-102333334r2+2r1,r3-3r1,r3-3r11-2-1020006-20322-10963-2r4-3r31-2-102

(a1,a2,a3,a4,a5)=13213-1101-111102-13120r1+r2,r3+r2,r4-r204222-1101-10211102111r1-2r3,r4-r300000-110

A=[a'b'c'd']=1-15-111-233-18113-971-15-102-7402-7404-1481-15-102-7400000000103/2101-7/2200000000{a,b

‍解:(a1^T,a2^T,a3^T,a4^T)=11111102100-3r1-r2,r2-r3001-10105100-3r1r3100-30105001-1所以a1,a2,a3是一个

(a1^T,a2^T,a3^T,a4^T)=2-138111517-19110-211r1-2r2,r3-r2,r4-r20-31-2111506-2409-36r3+2r1,r4+3r1,r2-r1

1-1211-1211-1211-1212-24-2r1*(-2)+r2000-4===>0001===>030-4306-1r1*(-3)+r3030-4030-40001030-4030-4000

17.（1）A=1-15-111-233-18113-97化为行最简矩阵：103/2101-7/2200000000r(A)=2极大线性无关组：a1,a2a3=3/2*a1-7/2*a2a4=a1+2

(a1,a2,a3,a4)=120320421t5t+4102-1r1-r4,r2-2r4,r3-r402-2400040t3t+5102-1r2*(1/4),r1-4r2,r3-(t+5)r202-

因为题目要求行向量组的一个极大无关组,需将矩阵转置再用初等行变换(1)A^T=3111-1302-42-14r1-3r2,r4-2r204-81-1302-401-2r1-4r4,r3-2r40001