X*0.6+X=2000000
    777.99*6%*(1-x)*2=70
    757.49x-770.49x^2=17.16
    （x-3.552）*400-0.1=1
    x-(X*0.11)=7283
    （x-4.847）*400-0.1=2
    sinx*e^(x^2)
    10lgX=-9
    10lgX=3
    x/14.38=0.014
    log(10,x)=-3.78
    log(10,x)=3.78
    x/7.7=0.023
    x/4.56=0.036
    x/4.56=0.079
    x/5=0.031
    （1+x∧2）/x
    26+x² = 30
    26+x²=30
    782÷（x÷2）=391

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