arctan(9*s/(1-10*s*s))=9.39
    -2x^2+240x=2250
    20-5x=5
    lnx-10=0.00000000000000000000103*x
    lnx-10=1.03^10-21*x
    0.8x+10*2.6+(x-10)*3.5=64.1
    26+2*3.5+12*0.8=x
    8=a(0+2)(0-8)
    （80-x+10）÷3+x÷4×6
    26+(x-18)*4.3+28=64.1
    58+0.2x=88
    20x+40(x+0.05)=160-88-58
    58+20x+88+40(x+0.05)=160
    2.6x+(23-x)*3.5=81.8
    2.6x+(23-10-x)*3.5=81.8-2.6x
    2.6x+(23-10-x)*3.5=55.8
    1-1.5/x＝0.15
    2.6x+(23-10-x)*3.5=81.8
    2.6x+(23-10-x)*3.5=81.8-26
    2.6x+(23-10-x)*3.5+(23-10-x)*2.6=81.8

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