(3-3*x)^5.3=39.4*x
    0.95543=cosx
    cosx＝0.95543
    5x^2+3800x-118500=0
    a×0.6=29.9
    a×0.6=17.8
    a×0.6=10.9
    a×0.6=6.9
    a×0.6=7.9
    x/（1-x^2）^0.5=0.7665
    e^x=0.09
    1b×3b
    n(n+2)=25. 774
    0=1400Q-（400+550Q）-84Q
    n(n+2)=29. 699
    0=1400Q-（400+500Q）-84Q
    0=1400Q-（400+500Q）-1400Q*0.06
    0=1400Q-（（400+500Q））-1400Q*0.06
    0=1400Q-（（400+500Q）+331.569+25+0+0）-1400Q*0.06
    n(n+2)=121. 35

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