75*1.39*10^3
    16sin(2π/3+3π/2)
    10lg(5)=
    10lg(5)=
    10lg(5)=
    （-0.25）^3-0.25+1
    10lg(300)=
    -10lg(300)=
    20lg100
    10lg(0.001)=
    90-arctan(3.41/2)-arctan(3.41/5)-arctan(3.41/10)+arctan(3.41)+arctan(2.93*3.41)-arctan(34.1*3.41)
    0.086*34.1
    10/3.41/0.086
    -10lg(1-0.35)=
    -10lg(1-0.37)
    ln1.2×2×e
    ln1.2
    1.2e－0.21
    ㏒(3，27)
    e0.6

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