2/3*((1-1/0.03)+(3/4+1/0.03)*(1/3*220/x*0.35805183739485175)^0.03)=6.794/x
    2/3*((1-1/0.01)+(3/4+1/0.01)*(1/3*220/x*0.35805183739485175)^0.01)=6.794/x
    2/3*((1-1/0.01)+(3/4+1/0.01)*(1/3*220/x*0.35805183739485175)^0.01)=7.11/x
    2/3*((1-1/0.03)+(3/4+1/0.03)*(1/3*220/x*0.35805183739485175)^0.03)=7.11/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*220/x*0.35805183739485175)^0.05)=7.11/x
    2/3*((1-1/0.07)+(3/4+1/0.07)*(1/3*220/x*0.35805183739485175)^0.07)=7.11/x
    2/3*((1-1/0.07)+(3/4+1/0.07)*(1/3*220/x*0.35805183739485175)^0.07)=7.3186/x
    2/3*((1-1/0.07)+(3/4+1/0.07)*(1/3*220/x*0.35805183739485175)^0.07)=7.3186/x
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*220/x*0.35805183739485175)^0.05)=7.3186/x
    2/3*((1-1/0.03)+(3/4+1/0.03)*(1/3*220/x*0.35805183739485175)^0.03)=7.3186/x
    2/3*((1-1/0.01)+(3/4+1/0.01)*(1/3*220/x*0.35805183739485175)^0.01)=7.3186/x
    0.25x-0.75=0.5÷0.4
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*4.8)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*2.88084)
    X=(7+1.54+X)*9%
    x+5x/10=6000
    3a^2+14a+10=0
    100+20t=340[41-（10+t）]
    （X-2250-5000-1900）*0.03=X-7727.5-2250
    （X-2250-1900-5000）*0.03=X-2250-7727.5

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