0.7125=（（0.021*x^1.85+17.2）^0.5）*x^0.84
    0.8907=（（0.021*x^1.85+17.2）^0.5）*x^0.84
    0.9158=（（0.021*x^1.85+17.2）^0.5）*x^0.84
    1.7531=（（0.021*x^1.85+17.2）^0.5）*x^0.84
    450x-（310.02+240x）-（450x*0.13-15x-30.4）*012=0
    450x-（309.02+240x）-（450x*0.13-15x-30.4）*012=0
    2100*(1+x)*x=118.87
    2100*(1+x)*x=110.25
    （186-X）/X=0.8
    （186-X）/X
    0.125671/x＝0.1289/0.86289
    0.4/100.58＝x/31.6
    （39.402+x）×2.5＝39.402+72.204-x
    （42.309+x）×2.5＝39.402+72.204-x
    x^2-3x+2=0
    52x+32x-112/5=6
    -50x+26-52x=6
    x^2-2x-3=9/5
    19.926cosx+10sinx=20.034
    19.26cosx+10sinx=20.34

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