5.75/60
    (5+45/60)
    (5+45/60)/60
    3.36÷4.2
    4.2×10^3*40×20
    50%*70%*80%
    0.15×4×10^7*52.5%
    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

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