1200=3.14*0.5*(40*3+30+4+50+2+80*x)+2200*3.14*0.25*0.25
    x/4*3.14*6371000=16/3*10^8/1.2*10^29
    2.14-1.92/（1-x）
    （23+x）*0.65=50.63
    x（x+4）=2
    370400=8.314×300÷(x-0.0000806)-(27.24÷√300)÷x÷(x+0.0000806)
    （4.72-4.72/1.13*0.13+0.12）/7.0=X
    （5.71-5.71/1.13*0.13+0.14）/7.0=X
    （26.253+x）×2.55＝52.306+69.859-x
    （26.253+x）×2.35＝52.306+69.859-x
    （26.253+x）×2.15＝52.306+69.859-x
    （26.253+x）×1.95＝52.306+69.859-x
    （26.253+x）×1.75＝52.306+69.859-x
    （26.253+x）×1.55＝52.306+69.859-x
    -9x^2+6x+3=0
    174x-153.9=1.25（200x-190）
    x-48=x²
    60x^8-105x^6+62x^4-14x^2+1=0
    (1413.4×10^3)/(0.993×31730.1×215)+(0.977×462.04×10^6)/(1.15×7934076.85×(1-(0.8×1413.4)/351439.81k)×215)
    x

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