l²+3l²
    72+15l-l²=72+30l-3l²
    72+15l-l²=72+30-3l²
    ex+sinx=1
    （0.001+x）/（0.1-x）/（0.01-x）=32
    （0.001+x）/（0.1-x）/（0.01-x）=32
    3*x+3*x+2/x+6/(x+x)+12/(x+2*x)=21
    （0.001+x）/（0.1-x）*（0.01-x）=32
    594154=92000×n^25+100000×n^24+100000×n^23
    60%-15%-[（1+X）/X]*5%=0
    x²+x-240=0
    X+x2=14
    aratan(6.19/0.61)
    e^x=√（x+1）
    985608/486000=n^26
    x*1.51=3.88
    584342/292000=n^25
    (X-1110089.15)/X=0.016
    0.137*X^-3+0.119*X^-2+0.269*X^-1 = 0.1868
    595255/292000=n^25

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