5

5.1

ql

q

BCA

ABA

q

MBA+MBC=0 B ()

BC BA () () ()

5.2 M Q

4i2i03i0ii0

5.3

aBZ1ABCZ2b5.4 ab

Z1=1Z2=1der11r21r12r22qMPCR1PR2PCcde

Z1 Z2R1R2:R1R2

nn

,,Z1=1Z2=1B

ABC

,123456

12iEI0=1Z 1 Z 2Z3

3r11Z 1+ r12Z 2+ r13Z 3+R1P=0 r21Z 1+ r22Z 2+ r23Z 3+R2P=0 r31Z 1+ r32Z 2+ r33Z 3+R3P=0 4r11r12r13r21r22r23r31r32r333241.53r11=3+4+3=10kr12=r21=2r13=r31=?34221r22=4+3+2=9r23=r32=?

Z 3=11/21/29/89/8r33=(1/6)+(9/16)=35/48r31=r13= 9/8r32=r23= 1/25R1PR2PR3P(1/8) 2042=40(1/12) 2052=41.7R1P=4041.7= 1.7R2P=41.7R3P=0

678MkNm18.642.847.826.723.814.953.68.93.979