arcsinx+arccosx
    27t-5t²＝9.6
    27t-5t²＝9.6
    (3-x)^2+9x^2=9
    11/15-x+3/5=1/2
    x+1/xx+1
    255.7×7.94+12.08x=（255.7+x）×7.97
    255.7×7.93+12.08x=（255.7+x）×7.97
    1100/v+10000/(v+22.4)=64.96
    5100/v+10000/(v+22.4)=85.042736
    5100/v+10000/(v+22.4)=85.04
    5100/v+10000/(v+22.4)=85.04
    0.05x+0.02（4500-X）=4500
    （35+x）÷（87+x）=0.5
    (x-95)/95-(x-100)/100=6%
    (X-95/95)-(X-100/100)=6%
    x²（2+3x²）＝1
    x²（2+3x²）＝1
    x²（2+3x²）＝1
    96+x/160+x=0.618

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