（0.00084）^2 = (0.0006^2)*(x^2)+(0.001^2)*(1-x)^2+2*0.9*0.0006*0.001*x*(1-x)
    16×(1+0.06)＾x=21×(1+0.02)＾x
    16×0.06＾x=21×0.02＾x
    15i(((1+0.75i)^20-1)/0.75i)+12i(((1+0.75)^9-1)/0.75i)=64
    （0.084%）^2=0.06%^2*x+0.1%^2*(1-x)^2+2*0.9*0.06%*0.1%*x*(1-x)
    X+0.10%X=1078.11
    X=260-260/(1.17)*0.9+260*0.08/360*65+0.5%X+5000/474+15%X+3%X+1900*7/471
    1000000=250000/(1+i)+250000/(1+i)^2+250000/(1+i)^3+250000/(1+i)^4+250000/(1+i)^5
    X=260-260/(1.17)*0.9+260*0.08/360*65+0.5%X+5000/474+0.15X+0.03X+1900*7/471
    0.7x<0.05
    337*x*x/256=13.3*13.3
    100x-4=(115x-4)(1+x)
    107sin（1.23x+0.841）-90=-3.34
    x－4.455＝x÷100
    3x+6
    x^2+5x-10=0
    0.0082*x^-0.06+2.6*x^-0.82=0.01
    8.2*x^-0.06+2.6*x^-0.82=0.01
    3.88*10^-6=(0.475-x)/19320+x/11340
    x^7+1-(x+1)^7

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