X^2+5.1×10^(-4)X-5.1×10^(-6)=0
    3+x=7
    0.0968t+0.5*9.8*t*t=0.0473
    0=-155+12/(1+x)^20+42*((1+x)^20-1)/(x*(1+x)^20)
    2000-10x=1.96*0.1*x^1/2
    z^4+2z^3-2z+1=0
    1.03+226.95X>7.94+149.58x
    1.03+226.95X=7.94+149.58x
    1.1^x*0.9^(100-x)≥1
    1.1^x*0.9^(100-x)≥2
    1.1^x*0.9^(1000-x)≥2
    1.1^x*0.9^(1000-x)≥1.5
    1.1^x*0.9^(1000-x)≥1.1
    1.1^x*0.9^(1-x)=1.5
    1.1^(1-x)*0.9^x=1.5
    134.5+3.5x+75=3*155
    1.1^(1-x)*0.9^x=1
    x＾2-0.5x+1=0
    -4.245268((0.44-0.0167x)sin(140.454/(15-0.3x))-0.0823x)+0.9=2
    -4.245268((0.44-0.0167x)sin(140.454/(15-0.3x))-0.0823x)+0.9=0.5

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