e^x=101
    30x²-61773811.2x-1172266905.6=0
    4+【（18-10x/544）/91.62】*0.03=（2.1/x/1600-120）*0.07
    e^x=5001
    4+（18-80x/544）/2.7486=（2.1/x/1600-120）*0.07
    e^x = 2001
    e^x = 1001
    e^x=501
    e^x = 101
    e^x=100
    {10*【（1-x/544)-（-0.8）】/【1.54-（-0.8）】+90}*0.03-{【10*（0.22-0.01）/（x/1600-0.01）】+90}*0.07+4=0
    e^x=7000
    0.4*e^x+0.6-e^(0.9*x)=0
    7+{10*【（1-x/544)-（-0.8）】/【1.54-（-0.8）】+90}*0.03=3+{【10*（0.22-0.01）/（x/1600-0.01）】+90}*0.07
    4+{10*【（1-x/544)-（-0.8）】/【1.54-（-0.8）】+90}*0.03={【10*（0.22-0.01）/（x/1600-0.01）】+90}*0.07
    7+{10*【（1-x/544)-（-0.8）】/【1.54-（-0.8）】+90}*0.03=3+{【10*（0.22-0.01）/（x/1600-0.01）】+90}*0.07
    7+{10*【（1-x/544)-（-0.8）】/【1.54-（-0.8）】+90}*0.03=3+{【10*（0.22-0.01）/（x/1600-0.01）】+90}*0.07
    arctan(x)+arctan(0.2x)=90
    157838÷12000＝x÷125938
    (1-x)^0.5

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