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2、131x89.2:0.2580%:x31 x4315x x43215(900x):(700x)3:2 x: =12.3 : =x:12x x7470%x x3.65125%10x 535x 32153x 1242(x2.6) 834751999 248198 2843598 724298345497 3820504 587204 37002185815259468741532 630216184 178254 97514921382057413258 28359797412.4385.857.438 8.649.8512.36 2.4833.25.81.483813125 25134 2345 40735 25645 2524 12524 20(175) 4825125 10226 25(1312) (57)802763827662 162519 1521952194618181853 629671 293.173.17719914 759975 10236 49808018 9759785431475213975246%454554% 40% 311282731318