x*x-5=0
    x*x+5=0
    60x=100(x-2)
    (x+1)(x-1)=3.14
    （3ex＋1/ex）/（ex＋1/ex）＝5
    ex
    （X×1.5）=20
    3∧x=1/x
    X+（X×1.5）=20
    500n*(n-1)=18000000
    arctanx+arctan（x/10）=90
    arctanx+arctan（x/10）=3.14/2
    3s^4+10s^3+21s^2-8s-16
    1/3∧x
    2.8(x+24)＝3(x-24)
    x×（x＋2）＋（x＋1）＝29
    8-5t＝-12-3t
    8-5t＝-12-3t
    x+1/x+2
    [(x+8)÷0.2]－[(x－3)÷0.5]=1.2－(x+16)÷5

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