(8+12x)(x-0.5)=23.8x
    (8+12x)(x-0.5)=8.28x
    (8+12x)(x-0.5)=8.28
    2480000=(8.314*290)/(x-0.000045)-9.86/290^0.5(x^2+0.000045x)
    260×10^6=2002000x-1785.5x^2
    260×10^6=14.3×250x（560-x/2）
    20*w^4-47.5*10^3*w^2+2.5*10^6=0
    20*w^4-47.5*10^3*w^2+2.5*10^3=0
    16a+16=2
    180x-4x²=2100
    artan2.24
    a×0.6=34.9
    ln（（273+2x）/273）/0.105+ln（（303+2x）/（273+2x））/0.192=7.0257
    0.003m+1500=1000
    x*0.003+(x-500000)*0.15*0.01=5000
    1000=(15000+ (m - 500000)*0.015)*0.2
    a×0.6=42.9
    a×0.6=39.9
    a×0.6=41.9
    a×0.6=54.9

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