（250/102+750/133.58+650/44.7+100/45.1+1.4+1.2）/4.95=
    （250/102+750/133.58+650/44.7+150/45.1+1.4+1.2）/5=
    5^12
    （5/102+15/133.58+13/44.7+3/45.1+.028+.024）/0.1=
    （50/102+750/133.58+650/44.7+150/45.1+1.2+1.4）/5=
    （50/102+750/133.58+650/44.7+100/45.1+1.2+1.4）/4.95=
    6×(π÷2－2×1.05×tan20)
    6×（π÷2+2×1.05×tan20)
    60×cos20÷cos13.35
    2×tan((20)×(－0.64)÷45)+0.0149
    2×tan(20)×(－0.64)÷45+0.0149
    6÷（-3）加2^2×（1-√4）
    2tan(20×(-0.64)÷45)
    cos60
    cos30
    1/3.6×0.03×30+〖30〗^2/(25.92×0.84×0.8×9.8)=
    1/3.6×0.03×30+〖30〗^2/(25.92×0.71×0.8×9.8)=
    arccos0.6611
    arccos0.8781
    arccos0.8187

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