2

( ) (2k x 7) o o o -dxò 0.4 x = 3.2 4.-32 12+21 —12 -& X +8 ...endou/test/soft/h18-13a.pdfo, +1. 25=7.5+0.25 = 730 2x—3 10 t 31 t 41 = 13 +5 32 t = 61 71 40 go = 640 K 81 Okm,

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