7 = 6 = = 1.6 0.7 = 13 =314 37 45 54 13 = = 0.15 = = =514 514 18 52 13 37 78 12 13 13 12502768457( + ) 48 431825x 912x56 3812 25 23 3 14 817 123 917 165 45 ( ) 14 259 54 45 59 12 13 56 149222 16 3 1243865183721586X= 15X= X =2472186510989+ 88 2569819 23 54 14 57 56(18 ) 14 12 956 625 711 78 35x= x9= x 15 x 34 1516 13 58 29 674 9 9 3 56 56 23 23 38 12 38 45 45 4 4 56 23 56 89 914 32 914 715 115 71512 12 920 47 38 47 83 512 52 5124 1 3 14 0.498355 751816942139116x 18 ( ) 34 16 4387154521036521215431516857795814 22 16 14921243865183723 1586