Mathematics
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    0.5*π*1.5(70*14.1+80*4.47)+0.25*π*1.5*1.5*0.49(430+5*(117+9.3*4.47)/(15.6+4.47)*(12.6+4.47))
    (1000+202.5+50+250+26.51*(168-166.40)+186.88(163.6-149.5)+10.07*4.93)
    12cos3.16-72(cos(3.16*2))(36(cos3.16)^2+325)^(-1/2)-(36(cos3.16)^2+325)^(-3/2)*2592(sin3.16)^2(cos3.16)^2
    0.5*π*1.5(70*14.1+80*4.93)+0.25*π*1.5*1.5*0.49(430+5*(117+9.3*4.93)/(15.6+4.93)*(12.6+4.93))
    12*sin3.16-36*(sin2*3.16)*(36*(cos3.16)^2+325)^(-1/2)
    12sin3.16-36(sin2*3.16)(36(cos3.16)^2+325)^(-1/2)
    12*cos3.16-72*(cos2*3.16)*(36*(cos3.16)^2+325)^(-1/2)-(36*(cos3.16)^2+325)^(-3/2)*2592*(sin3.16)^2*(cos3.16)^2
    12cos3.16-72(cos2*3.16)(36(cos3.16)^2+325)^(-1/2)-(36(cos3.16)^2+325)^(-3/2)*2592(sin3.16)^2(cos3.16)^2
    12cos3.16-72cos2*3.16(36(cos3.16)^2+325)^(-1/2)-(36(cos3.16)^2+325)^(-3/2)*2592(sin3.16)^2(cos3.16)^2
    15÷10/21
    2.6/4
    400^4
    10^-8
    (ln(1416.24/262))^(-1)
    【2(√5-1)】÷(√5+1)
    2(√5-1)
    2/3*1*14.3*3.1415926*400^3*(sin(180*0.2288))^3/3.1415926+360*7959*332*(sin0.2288*180+sin0.7924*180)/3.1415926
    2/3*1*14.3*3.1415926*400^3*(sin(180*0.2436))^3/3.1415926
    1 2 3 4 5 6 7 9 0 1 2 3 4 5 6 7 9 × 8 1
    2/3*1*14.3*π*400^3*(sin(180*0.2436))^3/π

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