x=(0.05-x)×(2.55-x)×1738
    (400-(x-20)^2)^(1/2)=-(100-(x-10)^2)^(1/2)+10
    x=11220*(0.05-x)*(2.55-2*x)^2
    7:4=28:x
    7:4=x:28
    0*cos(x)+1.1*sin(x)+0*x+1=0
    3000+x=x/0.15
    -0.24（t-53）=-2.2
    [(220+220+260）*55-x]*0.85=29504.75
    [(220+220+260）-x]*0.85=29504.75
    [（220+220+260）*55-x]*0.9=29504.75
    4x^2=(x-2)(x-1)^2
    x(x+1)^2=2(x-1)^3
    （x-129.055）*10-1-1=2
    73×7.98+87.6x=7.96×160.6
    73×7.98+87.6x=160.6×7.93
    （x-106.200）*10-1-1=2
    A-176658343.61-（A-150681321.92)*0.5%=51962.67
    （x-128.411）*10-1-1=2
    13.8+n×4.3

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