2/3×1×14.3×3.14×〖450〗^2×450×(sin (0.28π))^3/π=
    C(5,0)*2^0+C(5,1)*2^1+C(5,2)*2^2+C(5,3)*2^3+C(5,4)*2^4+C(5,5)*2^5
    C(4,0)*2^0+C(4,1)*2^1+C(4,2)*2^2+C(4,3)*2^3+C(4,4)*2^4
    C(6,0)*2^0+C(6,1)*2^1+C(6,2)*2^2+C(6,3)*2^3+C(6,4)*2^4+C(6,5)*2^5+C(6,6)*2^6
    C(3,0)*2^0+C(3,1)*2^1+C(3,2)*2^2+C(3,3)*2^3
    C(3,1)*2^2
    (100/95)*5
    5.2631579/5%
    100/(21/20)
    90*100/90
    95*100/90
    √2＋1×√2＋1－2×√2＋1+2
    100*100/95
    252.85*11.23+3852.8*4.03+91.46*23.5+384.92*19.5-101.09*16.69-345.46*16.69-644.68*11.99-1651.6*4.5
    -1×56
    13+21
    (20+17.6*4.5+19.1*2.7)*0.57-2*24*0.75
    1.62*0.5*2.3*(32.12-4.6)
    .62*0.5*2.3*(32.12-4.6)
    2.3*4.6*1.24

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