sin(2x)>=(1/(2^(1/2)))
    cos(x)>=-(1/2)
    cos(x)>-(1/2)
    （x-250）（8+290-x/5x4）=480
    7/12*x+12=3/5(x+12)
    sqrt（x-1）-sqrt（2x-1）>sqrt(3x-2)
    w^4+w^2-100=0
    5x^2+60x+135
    （x^x）−11x<-28
    （x − 7 ）（x − 4 ）
    （9%-x）/(9%-6%)
    (1.2263*x-5.3842-49)/9.84/sqrt(1.1+(x-39.7)^2/980.1)<1.8595
    (1.2263*x-5.3842-49)/9.84/sqrt(0.1+(x-39.7)^2/980.1)<1.8595
    6^75=77
    a*1.45*1.4*300/(300+406)*2+a*1.45*300/(300+406)+64720*0.2<64720
    a*1.45*1.4*300/(300+406)*2+a*1.45*300/(300+406)+64720*0.2>64720
    x+1<>1
    x^4-2x^3-6x^2-2x<=0
    -2*x-12<8-2
    x-12<8-2

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