x=(x+284400)/1.06*0.06*1.12
    x=(x+284400)/1.06*0.006*1.12
    tanx=sin70/(1－cos70)
    x^2+0.56x-0.14=0
    x^2+0.56x-0.14=0
    x^2+0.56x-0.14=0
    x^2+0.56x-0.14=0
    x^2+0.56x-014=0
    x^2+0.28x-014=0
    3/4x+63=6/5x
    3/4x+63=6/5x
    3/4 x+63=6/5 x
    0.906x-0.105sin(2πx)-0.1023=0.21(sin(πx))^3+0.0354sin(πx)+0.0354sin(1.25π-2πx)
    10-（10-x)×2＝76
    10x（10-x)×2＝76
    0.827x-0.094sin(2πx)-0.099=0.21(sin(πx))^3+0.0388sin(πx)+0.0388sin(1.25π-2πx)
    （30-3x(20-2x）=450
    （6x-16）：（5x+4）=10：9
    60%=1000/x
    x^2+24/5x-6＝0

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