7x*3-4=147
    7x*3/4=147
    -( X+1)( X-3)=-x-1
    -0.1(x-4)^2+4=0
    16 a+4=2.4
    -0.15x^2+0.9x+2.4=0
    x＋x×0.5=1280
    -3/20x^2+9/10x+2.4=0
    -3x^2+30x=63
    -3x+30x=63
    -3x+30x-63=0
    3000*0.01a*150*1.1+5000*0.05*96*(1-1.25*0.01a)=47250
    12*0.02*325*(1+0.12a)+13*0.019*300*(1－0.1a)=156
    30*a*165+250*24*(1－0.05a)=47250
    （34*π*x^2）/（12*180）+2*x/3-34*π/180=0
    2.78x/(x+1400)
    Arctan0.6823
    x+arctanx＝π/2
    x^3+x=1
    2X÷7=6

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