10(4-x)-10x
    x^2-26x+175
    x∧2-26x+175
    x2-26x+175
    480÷x×75%=495÷(x+3)
    1.015/(2.46*10^-7*10) = (x-0.52)^2.75/2.75-(65.21-0.52)^2.75/2.75-1464.43*(x-65.21)
    1.015/(2.46*10^-7*10)=(x-0.52)^2.75/2075-(65.21-0.52)^2.75/2.75-1464.43*(x-65.21)
    2/12×（m-1）-4/4-3m=1-1/12-2m
    10+20*x=10+20*x
    5t/2+80=3(160-10t)
    5t/2+80=3(25t/2-80)
    25t/2-80=3(160-10t)
    25t/2-80=3(150-10t)
    3=OE*(4-OE)
    20x-(15x+80)=0
    x-0.0956*sin(2*3.1415926*x)-0.1664=0
    T=4000×0.1÷[（82-8.2）×10^-6×4000×24]
    -2(2-x)+(1+x)=0
    50x+60(67-x)=3650
    -x/2=e^x

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