50.8×77+92.53×74.5
    50.8×77+92.53×71.7
    （4774.1+263+200+1250）*1.75*4.72*3
    sin5π/2
    sin5/2
    cos97
    √2+1
    sin105
    sin22.5
    3.162278*2+6+4
    sqrt(1^2+3^2)
    415.156+4561.13
    2.12×1800／（2×163×1.0－0.5×2.12）＋2.0
    -1/12×〖6.5〗^2×156.49-1/20×〖6.5〗^2×90.59=
    1/12×〖6.5〗^2×156.49+1/30×〖6.5〗^2×90.59=
    -1/12×〖6.5〗^2×65.9-1/20×〖6.5〗^2×90.59=
    1/12×〖6.5〗^2×65.9+1/30×〖6.5〗^2×90.59=
    -1/12×〖6.5〗^2×167.321-1/20×〖6.5〗^2×110.826
    1/12×〖6.5〗^2×167.321+1/30×〖6.5〗^2×110.826=
    -1/12×〖6.5〗^2×56.495-1/20×〖6.5〗^2×110.826=

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