x*1.06=0.2556
    x²－7x+1710＝0
    x*1.015=42.018
    1.05*x=42.018
    1.05*x=42.018
    -3x^2+4x+76=0
    2^x=x^32
    10800x=30(10800+x)
    861.14=x+x*0.006
    1041.21=x+x*0.006
    950.16=x+x*0.0003
    955.86=x+x*0.006
    x+x*17%=10000
    (1+r/4)^4-1=10.25%
    （1+r/4)^4-1=1.25%
    80（1+x）+100x
    80（1+x）+100x
    x^4-4x^3-4x^3+16x-384=0
    (3x+2)/4=8
    2x^2+2x+1＝0

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