(x-91.158)*50-(1+1) =-6
    (x-91.158)*50-(1+1) =-5
    (x-91.158)*50-(1+1)=2
    100x＾2+145x-9=0
    (x-91.158)*50-(91.158*50*0.025%+x*50*0.025%) =-5
    (1+1/x^(1/2))^x
    (x-91.158)*50-(91.158*50*0.025%+x*50*0.025%)=2
    x^x^8=8
    2x∧3+10x∧2+15x+4=0
    2x∧3+10x∧2+15x+4=0
    2x∧3+10x∧2+15x+4=0
    2x^3＋10x^2＋15x＋4＝0
    sinx=30/600
    0.5208*X/（1-0.5208*X）=30%
    x*x/(600*600)+(120*120-240*x+x*x)/(90*90)=1
    90*90*x*x+600*600*(120*120-240*x+x*x)=1
    x^1/3*x^1/2
    90*90*x^2=600*600*(120*120-240*x+x*x)
    20-x＝20-0.5x-（50/x）
    (1.667*12.5*0.4*X）/（1-1.667*12.5*0.4*X）=0.3

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