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, , ,4.82.5 =2.330.54 =1.5105 =1.22.5+0.82.5 = 0.0340.50.6 = 1020.45 = 0.65201 =, ,0.867 =12.542 =1.0625 =270.43 =,5.980.23 =19.765.2 =10.84.5 =211.4 =, ,X+3.2 =4.6(X-3) 2=7.5X7 =0.34X-39=292X-7.5=8.55(X+1.5)=17.5X-0.36X=1642X+25X=134, a a t c 7 94 a 8 b 30 30 a=60,b=75 b a 3X X 50 50-C C , 24 3 6 9 1.5 330 m 100 m 200 m 1.8 m 5km5 2 8 , ,50 x 33=1650 （m） 35x122=210 （m） 1650 +210=1860 （m）,(4070) 302 =165030 15 = 450 1650450 = 1200, ,20 10 = 200c20102= 100 c200100= 300 c,