[ ] :2+1 - g =3\rKS 1 : 3300+5+3+3\r=3300+11\r= 300 \rf300x5=1500 \r : 300x3=900 \r300x2=600\r30-1? GfI1500 PI900 PI600\rK : 45!9 * 45 ,\r=405 - 45 ,\r= 360 .\r31-1? G6360\r Ge~x P"~ 1+10% x P"80".S@\r1+10% 80 = 3\r- J+80-\r1 3 8 0 = 3\rx+80 4\rL lx - 80 x4= x+80 x3\r4.4x 320=3x+240\r4.4x - 320*320 - 3x=3x4240+320 - 3x\r1.4x=560\r1.4x^1.4=560-5-1.4\rx=400\r400x 1+10 +400\r=400x11*400\r=440+400\r=840 \r32-1? GO +O~84¡.\rY 1 2 Z 1 3 Z.\r¢ :£ ¤ GZ = 5 : 6 , Z G¥= 3 : 2 = 6 0 4 ,\r£¤G¦ G§: 5 :6 :4 ,5 *6 *4 = 15 ,\r4504=150±8@ 450< a =180%g , 450, ==120±g\r3 3 -1 .? G? ¨ 15© ª ,«18© ª ,¬ 12©.\rY 1 3 Z 1 3 Z