1 5x＝10－x
    12321w^2+900=w^2(1722w^2+1)（0.01w^2+1)(0.04w^2+1)
    0.019w^2+0.3w=0.97
    w^2(0.01w^2+1) (0.04w^2+1)=900
    x^2+2x>0
    x^2+x>0
    (x+1)(x-2)(x+3)>0
    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

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