660x^2-4212x+6471=0
    0.1^x
    0.01lnx+x=-0.0828
    lnx＋100x＝-8.28
    x+lnx＝-0.0828
    x-2=18
    3/4k+6k=3k+15
     4s−13/3=12s−15
    5a/6+4a/3=14+a
     43−2x=−21−3x
     4−x/2(2x+3)=1/2
     5p−3/2−3/4p=24
    (x-1)(x-20)(x-20)=144
    4.5577=（（28.02*0.639（x+0.1））/（1+0.639（x+0.1））*（（100-6.66-1.14）/100）*（1/(1+0.31*1.14)）+（（0.76（x+0.1））/（1.3*0.101325））
    x^2-5x+3
    acrsin0.4739
    （0.994-x）*300+（0.818-0.790）*300+（0.819-0.790）*300+0.1+0.1+0.2+0.2=（0.994-0.769）*300+0.1
    （0.994-0.769）*100+（0.994-x）*200+（0.818-0.799）*300+（0.819-0.799）*300+0.1+0.1+0.2+0.2=（0.994-0.769）*300+0.1
    （0.994-0.769）*100+（0.994-x）*200+（0.818-0.790）*300+（0.819-0.790）*300+0.1+0.1+0.2+0.2=（0.994-0.769）*300+0.1
    xsin1/x^2

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