x-(x-800)*0.2=2000
    2x^3+11x^2+10x+8=0
    2x^3+11x^2+10x+8=0
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.821)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.821821)
    arcran-0.77
    （0.9876x/265）^2.519+(X/221)^2.011=1
    100a+120(300-a)=33000
    135a+120(300-a)=15300
    30000（x+50）=12000*3*x
    30000（x-50）=12000*3*x
    30000（x-50）=12000*3*x
    x*x=9
    1/x+x-88=999
    1/(1/750+1/x)=400
    x^2-47/7x+841/49=0
    0.7384x-0.0828sin(2πx)-0.091=0.21(sin(πx))^3+0.0384sin(πx)+0.0384sin(1.25π-2πx)
    0.6674x-0.0748sin(2πx)-0.08225=0.21(sin(πx))^3+0.0384sin(πx)+0.0384sin(1.25π-2πx)
    3x*x-2x-6=0
    0.020=0.0076X∧0.996

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