x²-56x=32
    w（3）
    0.16x^6+64.0025x^4-2304x^2-2304=0
    x²－50x－600=10000
    (400－150)－x*(1－25%)=100
    2x-1
    -2（x-2）=（6*（x^2+2））^0.5
    arctan0.2x+arctan0.05x=50
    (41+X)/X=764/737
    (0.041+X)/X=1.037
    (0.041+X)/X=1.036
    (0.137+X)/X=1.125
    (13.7+X)/X=1.125
    (x^2/2)/x×sqrt(2+(x^2/4))=1/2
    2x^2+3x+4=0
    36.45*（1-x）=9.14
    36.94*（1-x）=9.14
    6b²-21b+19=0
    84.1 = 36.372ln(x) - 2.0042
    50 = 36.372ln(x) - 2.0042

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