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
    x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+x+1=1
    1/3(x-1)+1/4(x-1/2)=1/3(x-2)-1/4(x-1)
    ((1+0.11)^2)*(1+r) =(1+0.12)^3
    (1+0.10)(1+r)=(1+0.11)^2
    x÷(0.1-2*x)∧2÷(0.025-x)＝1.26*10∧26
    x^0.67=7.511
    e3x=2

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