1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.458)
    (x*(1-x^10))/(1-x)=103500/18768
    (x*(1-x^10))/(1-x)=5.514
    (2146-X)/X=0.11
    (2426-X)/X=0.13
    (2791-X)/X=0.15
    （x+2)(x-7)-3x
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*2.28)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.375)
    6155=【（220+260）*21-x】*0.9
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*4.85)
    2826x+5024x^2=6500
    -x=95/18-31/4
    1/14+2/7+x=3/7
    -29.4sin(x) - (1296/25*sin(x))/(324/25 + 9 - 108/5*cos(x))^(1/2) + 4*54/5*sin(x)
    -29.4sin(x) - (1296/25*sin(x))/(324/25 + 9 - 108/5*cos(x))^(1/2) + 54/5*sin(x)
    x*(1-x)(1-x)=25(0.8-x)*0.6*0.6*(0.6-x)*(0.6-x)
    x*99.975%-134.100*100.025%=1/10
    44b^2+168-168b-4sqrt21b+8sqrt21=0
    x/(x+6000)=0.95

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