-2x+120x-1758
    （x－20）（2x+80）=150
    log(2,0.25)
    log(2,3)
    log(3,0.125)-log(2,0.25)
    11.65/233*96
    x^2-9x-30
    0.04*55
    2.84/71
    0.01*115
    3.99-0.01*60
    2*0.003/20/0.1*1000
    24.55*0.02*5/25/0.049
    24.55*0.02*5/25/0.0049
    7 × 8 + 30 × 14
    16 × 24 ÷ 2 + 32 × (36 - 16) ÷ 2
    xln（x/0.025） = 0.0138
    xln（x/0.025）=0.0199
    xlnx-xln0.025=0.0257
    sqrt[(2x)^2-x^2]

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