（x+1/x）（x+1/x）（x+1/x）=
    x+11.2x/sqrt(2079.36-x^2)=11
    x^e=1
    x*0.57*3.01=1.44
    （42.309+x）×1.45＝72.418-x+42.309
     x^2+0.052x-0.10044=0
    162÷x×（50-x）=72÷（50-x）×x
    162÷X*（50-X）=72÷（50-X）*X
    4x+128=1600
    3y+128=1600
    -lgx＝0.601
    -lgx＝0.593
    x*0.955-x/1.09*0.09*1.12+137656.18*1.12=121643281.64
    0.955x-x/1.09*0.09*1.12=121643281.64-137656.18*1.12
    x*(x+5)=1
    x=（3x-12-1）×0.333
    x^3-5x＾2+x+7=0
    q²-18q=0
    35x^2－36x＋6.4＝0
    -12500-(5000+a)×12%÷12+a=5000

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