4a^3-8a^2+4a=0
    0.85*42x+0.15*15x=16521*0.53
    0.85*42x+0.15*15x=12576*0.53
    0.85*43x+0.15*15x=16521*0.53
    0.85*40x+0.15*15x=16521*0.53
    0.85*43x+0.15*15x=12576*0.53
    0.85*40x+0.15*15x=12576*0.53
    0.85*41x+0.15*15x=12576*0.53
    0.85*41x+0.15*15x=12576
    0×4+36
    10+3+9*4
    2+0+5+0
    （y-1）+（y+5）
    2-[-x^2-3x-2]^2
    0.85*11
    20000^(-0.5)*600^(-0.5)
    20000^(-0.5)*600*(-0.5)
    19.6078*（x-153）/x = 2
    1.16*3
    1.16*1.2

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