30×25×4.2×10^3
    2*3.7+3.7+12+12+8+4+8+4+12+12+7.4+3.7*3+3.7+3.7+3.7+3.7+8+8+8+3.7*4+3*3.7
    2*3.7+3.7+12+12+8+4+8+4+12+12+7.4+3.7*3+3.7+3.7+3.7+3.7+8+8+8+3.7*4
    10(1/3)
    !(-1)
    -1/8+7/8*-11/27
    1*50*25*（3567-2692）（0.089+0.0782×0.1）/1000
    (4*(cos(2π/7))^2)*(4*(cos(4π/7))^2)*(4*(cos(8π/7))^2)
    (4*(cos(2π/7))^2)*(4*(cos(4π/7)))^2*(4*(cos(8π/7))^2)
    4*(cos(2π/7))^2*4*(cos(4π/7))^2*4*(cos(8π/7))^2
    4*(cos(2π/7))^2+4*(cos(4π/7))^2+4*(cos(8π/7))^2
    4*(cos(2π/7))^2+4*(cos(4π/7))^2+4*(cos(8π/7)）^2
    4*(cos2π/7)^2+4*(cos4π/7)^2+4*(cos8π/7)^2
    4*(cos2π/7)^2
    6218007/（1+6.81%）+1881769/（1-6.45%）+392425/（1+8.26%）=
    lg-1 0.6439
    lg-1 0.6329
    9/2-3*3+2
    30²-4*2400
    5/6×3

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