-2.2844443321228+-7.251088968572E-38
    ((874sqrt(2))^2+(2*2500+874sqrt(2)-sqrt(2500^2+1500^2))^2-2500^2-1500^2)/(2*874sqrt(2)*(2*2500+874sqrt(2)-sqrt(2500^2+1500^2)))
    ((874sqrt(2))^2+(2*2600+874sqrt(2)-sqrt(2600^2+1500^2))^2-2600^2-1500^2)/(2*874sqrt(2)*(2*2600+874sqrt(2)-sqrt(2600^2+1500^2)))
    ((874sqrt(2))^2+(2*2800+874sqrt(2)-sqrt(2800^2+1500^2))^2-2800^2-1500^2)/(2*874sqrt(2)*(2*2800+874sqrt(2)-sqrt(2800^2+1500^2)))
    ((874sqrt(2))^2+(2*3500+874sqrt(2)-sqrt(3500^2+1500^2))^2-3500^2-1500^2)/(2*874sqrt(2)*(2*3500+874sqrt(2)-sqrt(3500^2+1500^2)))
    ((874sqrt(2))^2+(2*135+874sqrt(2)-sqrt(135^2+1500^2))^2-135^2-1500^2)/(2*874sqrt(2)*(2*135+874sqrt(2)-sqrt(135^2+1500^2)))
    ((874sqrt(2))^2+(2*3000+874sqrt(2)-sqrt(3000^2+1500^2))^2-3000^2-1500^2)/(2*874sqrt(2)*(2*3000+874sqrt(2)-sqrt(3000^2+1500^2)))
    (32-X）/30=1/10
    32-x/30=1/10
    sin30
    (41.6+y)÷2+y＝18.2
    0.15*15x+0.85*38x=27000*0.53
    x2-6x+9=0
    0.15X*15+0.85X*40=27000*0.53
    3x^2-5x-12=0
    a(a-1)(a+2)(a+3)
    -5/9×1/3-4/3
    x^4+3*x^2+2*x+1=0
    （3x＋9）：（5x+9）=2：3
    40*0.85x+15*0.15x=14310

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