... = 2( a,+b|)h+ (2a,+2b| +27 r*l)h+ 2( 2(a,+bi)l + 7r.l') = 2( 21,5 + 93) .24 + (2. 21,5 + 2. 93 + 27 r.l 1,5) .24 + + 2( 2 (21 ,5+ 93).l 1,5 + 71.11,5') = 18 824 ,11 (mm') = 0,018 82 ... ST = 2( a,+b,)h+ (2a,+2b, +27 r*l)h+ 2( 2(a,+b,)l+ 7r.l') = 2( 21,5 + 93) .24 + (2. 21,5 + 2. 93 + 27 x. 11,5) .24 + + 2( 2 (21 ,5+ 93).11,5 +71.11,5') = 18 824 ,11 (mm') = 0,018 82 m'. ... -0 .2 -0.3 -0.9 -1.7 1 i' -2. 6 3. C=0,4^F Nhiet do (°C) 19 20 22 23 30 35 40 45 47 50 55 62 Chu ky xung (s) 0.5 72 0.5 72 0.571 0.569 0.5 52 0.540 0.531 0. 527 ...