7/5x+3/4x1/2
    1000000*15%+（100*100）/（1+15%）*15%
    59270000*ln(0.9*x)=4751*x
    1000000*15%+100*100/（1+15%）*15%
    710x^0.4+3.1201x=10000
    abs(-1.5p+4.5)=6
    n(n+2)=27.54
    -3x^2-24x-29=0
    （x-2）^2=(2x-5)^2
    x^(2)-280x+11500＝0
    x(-2x+5sqrt5)＝75/4
    1200/（1+x）+6000/(1+x)^2+6000/(1+x)^3=9000
    abs(-0.5x+4.5)=6
    (1-√3)m^2=0
    （1500×12×0.9-70%×110X×6.4%）÷（30%×110X+5%×110X）=3.8%
    11253*330+500*（1100-x）=(128*x/(1100-x)+(x-60)*128/(1100-x))/2*1400*60+0.5*128*x*x/(1100-x)*100
    b/10*8=180
    4.5x+4.5(x-6)=486
    (4-(3/4)*x)/((x-4)^2+(4-(x^2)/4))=((3/4)*x+x/sqrt(16-x^2))/(x*2+(sqrt(4-x^2/4)-2)^2)
    2x＝3(x－1)－35

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