5 - 1- 3 : ax=b xa=b,1.,-,2.,X+4.7=12,X4=24,1.5+x=10,3.5+x=6,. 1500 3,. 1500 3,3 =,3x=1500,( 0 ),0,( 0 ) -,2,X,40,3x+4=40,3x+4=40,3x+4-4=40-4 3x=36,3x+4=40,3x+4-4=40-4 3x=36,X=12 : =3x+4 =312+4 =40 = X=12,1)12x=36 (2)x9=13 (3)6+x=6.6 (4)x-54=108,12x12=3612,x=3,:x99=139,x=117,:6+x-6=6.6-6,x=0.6,:x-54+54=108+54,x=162,X,X,1.,1)x94300 (2) x4259 x9494300 x4242 59 x x (3)4x64 (4) x153 4x464 x15 3 x x,94,42,4,16,101,206,15,15,45,5,5,16,2 16 2,8,8,8,11.2,5 11.2 5,2.24,: 8 X= =2x+5 =28+5 =21 = 8 X=,: 2.2