x*0.7=48
    x*0.7=49
    100x=540+(20+5)x
    (x*2*0.75)/2=33
    (101325-10^(6.031-1211/(x+220.8))/(10^(6.031-1211/(x+220.8))-10^(6.080-1345/(x+219.5)))=0.5
    -x^3+12x^2-21x+10=0
    ( X+50% x)×90%-50- X=1000
    0.8x+arctanx=180
    0.1x+arctanx=180
    0.1x+arctanx=130
    0.1w+arctanw=130
    3cos（3x-0.5）=x
    3cos（3x-0.5）
    1000*（1+i）+1000*(1+i)^(2/3)-200*(1+i)^0.5-500*(1+i)^(1/3)=1500
    2*(0.24/2-x*0.025)-(2*0.01*1000/3.14/0.72/6.02214076/100000000000000)^0.5*(exp(x/2)-exp(-x/2))/2*96485.33289=0
    2*(0.24/2-x*8.314*298.15/96485.33289)-(2*0.01*1000/3.14/0.72/6.02214076/100000000000000)^0.5*(exp(x/2)-exp(-x/2))/2*96485.33289=0
    1000*1+i+1000*(1+i)^(2/3)-200*(1+i)^0.5-500*(1+i)^(1/3)=15000
    8.854187817/1000000000000*67.8077/0.0000000016729*(1.2/2-x*8.314*298.15/96485.33289)-(2*0.6*1000/3.14/0.72/6.02214076/100000000000000)^0.5*(exp(x/2)-exp(-x/2))/2*96485.33289=0
    32.78x/44.63-44.62*44.62*1091744.45/(x^2)/32.78/32.78=x-589223.09/(x^2)+27.528
    32.78x/44.63-44.62*44.62*1091744.45/x/x/32.78/32.78=x-589223.09/x/x+27.528

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