07线性代数讲义[1](15)

大学线性代数讲义前面有对知识的讲解,后面是习题。便于理解。不想挂科的同学们的必备之物

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2x1 x2+3x3=1 4x1+2x2+5x3=4(I)

2x1+2x3=6

^'´Xe{u:I ª~ I ª& 2x1 x2+3x3=1 4x2 x3=2(II)

3x1+2x3=6Inª~ I ª& 2x1 x2+3x3=1

4x2 x3=2(III)

x2 x3=5òI In § §¢ &

2x1 x2+3x3=1

x2 x3=5(IV)

4x2 x3=2òInI~ I I'4!&

2x1 x2+3x3=1

x2 x3=5(V)

3x3= 18

§|(V)'A´(9, 1, 6).

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a11x1+a12x2+···+a1nxn=b1a21x1+a22x2+···+a2nxn=b2

.............................................am1x1+am2x2+···+amnxn=bm@Üc¡'~f, £{´^e n«Ä)'g ,ò §|g¤FG.

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