0.4/0.45-1
    0.4/0.45-1=
    2/-1
    0.6/8
    (1/ln10)^2
    √8+ln(3-√8)
    1530/195
    14*5.142*2.83+46*3.664*0.888+14*4.542*0.888
    13*15*4.83+13*37*4.83+18*3.631*4.83
    15*(29.232+1.134)*4.83+25*(16+1.134)*4.83+15*3.486*4.83
    761.757*0.617+11*3.631*0.617
    -1.44*8/10+1.5*2/10
    [2*（0.046875+0.1875+0.421875+0.75+1.171875+1.6875+2.296875）+3]/16
    [2*（0.046875+0.1875+0.421875+0.75+1.171875+1.6875+2.296875+3）+3]/16
    2*（0.046875+0.1875+0.421875+0.75+1.171875+1.6875+2.296875+3）+3
    3*7/8*7/8
    3*6/8*6/8
    3*5/8*5/8
    3*4/8*4/8
    3*3/8*3/8

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