2*asin(4/5.5)
    sqrt((137-18*0.346)^2-324)/600
    (141-sqrt((4+18*0.341)^2-16))/600
    sqrt((137-18*3.46)^2-324)/600
    2.6（1+5%）^10
    2.8*2/1.5
    [(223+674)*(1+0.18+0.466+0.2+0.24)+311]*(445.1%*5+70%*12.5+125%*3)*(1*2.7)*（1+0.583）*0.8*0.5
    [(223+454)*(1+0.18+0.466+0.2+0.24)+311]*(445.1%*5+70%*12.5)*(0.8*2.5)*（1+0.583+0.69）*0.8*0.5 =
    [(223+510)*(1+0.18+0.466+0.413+0.2+0.24)+311]*(445.1%*4+70%*10)*(0.8*2.5)*（1+0.583+0.8）*0.8*0.5
    [（323+510）*（1+0.18+0.466+0.413+0.2）+311]*（762.3%）*(161.7%)*（0.8*2.5）*（1+0.466+0.5+0.8+0.2）*0.8 * 0.5
    [（323+510）*（1+0.18+0.466+0.413+0.2）+311]*（762.3%*2）*(161.7%)*（0.8*2.5）*（1+0.466+0.5+0.8+0.1）*0.8 * 0.5
    (50^2-42^2)/16
    (8.10+7.83+7.56-7.29-7.02-6.75)/(9/3600)/100
    (7.83+8.1)/(2/60)
    (7.83+8.1)/(10/6)
    (7.83+8.16)/(10/6)
    ln(-1)
    1.1＾24
    -1/16*(-1/2)^4+(21.375-20-1/3)*(-24)
    -0.25^2*(-1/2)^4+(21.375-20-1/3)*(-24)

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