8.07+（X*0.0257）=X
    19.90+（X*0.0257）=X
    10.78+（X*0.0257）=X
    5.02+（X*0.0257）=X
    6.3039+（X*0.0257）=X
    4.9239+（X*0.0257）=X
    4.695+（X*0.0257）=X
    x^3-2x+4
    6x-1/2x²
    (3x十5)/4x=7/8
    (3x十5)÷4x=7÷8
    a^3-15*a-4=0
    150（1+x）^2=216
    (84-x-x)*(56-x)*100=432000
    (84-x-x)*(56-x)*100=432000
    x*x-3x-5＝0
    x^2-2x+3
    x^2-2x+3
    24 x^2-260 x+150=0
    ex（x+1）

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