x^1.5=exp(x-1)
    x2 + 3x−10 = 0
    （7.5）^x=222.4/125.1
    1/2∧3x-1≤2
    6.2x^2-3.5x^2+2.2x=1
    x^4-3x^2-x=0
    x^4+560*x^3=0.35622
    0.5%/(1+5%)*13024*0.3967
    1+（3.2-1）/（3.2X+1）
    0.85143-0.503211*(11770/13024)
    11230/11770*0.5+540/11770*0.57
    100/13024*0.25+50/13024*0.4+50/13024*4.4008+10300/13024*0.08+2500/13024*4
    q^2（q^2+1）=5/16
    3÷2x-5＝5÷3x-3
    （1+x）（1-2x）^(2)
    10^(-5.8)-10^(-3.8)x-x^2=0
    x/3200+x/1000=1
    30/(1+2.75%)^7*3.5+30/(1+2.75%)^8*4+30/(1+2.75%)^9*4.5+30/(1+2.75%)^10*5+1000/(1+2.75%)^10*5
    30/(1+2.75%)^1*0.5+30/(1+2.75%)^2*1+30/(1+2.75%)^3*1.5+30/(1+2.75%)^4*2+30/(1+2.75%)5*2.5+30/(1+2.75%)^6*3
    （x-5000）*0.03=70

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