0.73+149.92+5.505x^2+21.47x-103.15-75.36-68.502x-19.535x^2
    9x×x+2x-3=0
    0.73+149.92+5.505x^2+21.47x-103.15-75.36-68.502x-19.535x^2
    1.4×2.5－0.2x=1.7
    0.73+5.14x^2+2.10x-103.15-75.36
    1.4乘2.5减0.2x=1.7
    24390=8.314×673×lnx
    7600/(x+101*0.12)+16400/x=150
    x^3+x^2-x+1=0
    x^3+x^2+x=0
    z^5=1
    x^4=1
    x^2=1
    x^3=1
    6x+x^2=31
    1+x^2+x^3=0
    (2+√2)x=10
    2(x^2)=(10-2x)^2
    x^2+(8/15)^2=3
    3-x^2=4-(4-x)^2

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