24*（6/2x）
    24*（2x/6）
    4x^2-9x+6=0
    420/30*x+135/30*(x+15)+90/30*(x+30)=983
    x-x/1.13*0.13*1.06=105
    0.357＝x*√1-x²
    （8450+100+X）*（5.36297%+1.4%）*1/4=X
    sin(x)+0.01*cos(x)=0.11
    sin(x)+0.01*cos(x)=0.14
    sin(x)+0.01*cos(x)=0.0267
    sin(x)+0.01*cos(x)=0.14
    sin(x)+0.02*cos(x)=0.14
    sin(x)+0.02*cos(x)=0.13
    （8450+100+X）*（5.36297%+1.4%）=4X
    sin(x)+0.02*cos(x)=0.13
    sin(x)+0.02*cos(x)=0.148
    sin(x)+0.1*cos(x)=0.148
    sin(x)+0.1*cos(x)=0.147
    sin(x)+0.1*cos(x)=0.14
    sin(x)+0.1*cos(x)=0.15

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