56/100=x/285
    7926.1=（440*21-x）*0.9+40*21
    x=1-2(128x^8-256x^6+160x^4-32x^2+1)^2
    5.103*10^-8x^4+10x-23307.5=0
    5.13x10^-8X^4+10X-23005.35
    x*1.015=266.945
    x*1.015=479.08
    x*1.015=83.23
    x*1.015=83.23
    x*1.15=83.23
    x*1.02=3069.18
    x*1.02=587.52
    -9.401t^{3}-18.21846t^{2}+224.26675t + 12.7181
    a^4+2a^3+3a^2+4a+5=0
    1a+2=66
    x^0.5＝0 09783
    sin(360/f)=50/8800
    x^2+x=9/16
    2/3*((1-1/0.02)+(3/4+1/0.02)*(1/3*220/x*0.35805183739485175)^0.02)=6.794/x
    2/3*((1-1/0.005)+(3/4+1/0.005)*(1/3*220/x*0.35805183739485175)^0.005)=6.794/x

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