55*0.92*X=3000
    sin(x)+cos(x)=e^(-x)
    2x^2-10x+2=0
    4p^(2)=（200-p）0.00959
    3432x^2+7200x+3432=0
    100000=2021.7x^0.4+2.292x
    x=1.9×0.802×217.93/200000×(1.9×30+0.08×32/0.0201)
    x/(1-x)^2=(0.98-x)*0.25*10^4
    3.2:0.4=x:8
    -1.672-0.353/0.03=x-0.353/-0.002821
    -1.6720-0353/0.03=x-0.353/-0.002821
    -1.6720.0353/0.03=x-0.353/-0.002821
    2x+1=7
    201+y=256
    201+y
    x^3+3*x+2.4=0
    500*150＝X100
    -lnx=0.386
    150/500＝100/X
    28（2X+8）＝80

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