100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=90.422
    x*222.64/(x*222.64+(1-x)*0.5*335.17)=90.422
     4.13×23.25/51.5+x×28.25/51.5=4.14
    32X=480-32*7
    32X-32*7=480
    480-（32*7）=32X
    7X-32*7=480
    a^2+5*a+25=0
    （x+3.2）/x=0.29
    （x+32）/x=0.29
    -285.8x-2219.9×5+2219.9x=-6264.2
    15x²+4x-4=0
    （1-2k）²-2（k²-1）=16+k²-1
    2m+3-m²=0
    x（0.05+x）=（10^-4.76）（0.95-x）
    （x-2019）（x-2020）=2021*2022
    9m-m=32
    36÷A×3=4
    5x^2-37x-24=0
    r*r/100*75/13.43=0.366*70*24*lg（r/0.175）

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