4B A X( )20,250,25V -=SMNC 48B A X A X3 4 8( ) ( )V V V - -= + =.S...

3. - THI THU DH +DAP AN MON TOAN
THI THU DH +DAP AN MON TOAN

3. 4

b a x

( )

2

0,25

V -

=

SMNC

48

b a x a x

3 4 8

( ) ( )

V V V - -

= + =

.S BCNM SMBC SMNC

48

3 12

b x a x

( )

m + )