tan(x)=1.135
    x-12%/18%-x=230/78
    0.854=0.9/(0.077*x)+1/tan(0.0385*x)+(1/(tan(0.0385*x)*tan(0.0385*x))+1+(2.1/(0.077*x))^2)^0.5
    12.14x=(3.5+x)*7.98
    -0.5x(x-3)²＝x-1
    0.5x(x-3)²＝x-1
    7X+1=8X-2
    6.9x－390＝（6x－600）（1＋20%）
    (20-x)(38-x)=544
    X-674.52-(X-674.52-10000)*3%=14128.54
    3x+2x=3
    X-578.52-(X-578.52-10000)*3%=11400.15
    X-462.16-（X-462.16-10000）*3%=12149.46
    X-674.52-（X-675.52-10000）*3%=9910.50
    tan（0.0373*x）=0.3269
    tan（0.0373*x）*tan（0.053*21.2）=3.394/4.979
    (155+232)/31*x+269.5/31*(x+15)+124/31(x+30)=1370
    a+0.02a=156979.99
    cosx/(x^2+1)
    a+0.02a=34102.5

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