(45.5-5-1.8)/2.153103
    1/tan75+1.32/tan35
    38.7/1.192224
    1/tan75+20*1.32/20*tan35
    45.5-20/4-1.8/tan45
    1.04167*0.04167
    53-0.75*10
    256/25×(-3/4)+6
    6e=
    227.17*(1.12+10.58)+3719.86*4.2+406.8*22.5+245.66 *18.5-1.2(803.11*(4.82+10.58)+1649.63*4.54)
    227.17*(1.12+10.58)+3719.86*4.2+406.8*22.5+245.66 *18.5-1.2(80.3.11*(4.82+10.58)+1649.63*4.54)
    227.17*(1.12+10.58)+3719.86*4.2+108.86*22.5+245.66 *18.5-1.2(803.11*(4.82+10.58)+1649.63*4.54)
    227.17*(1.12+10.58)+3719.86*4.2+108.86*22.5+245.66 *18.5-1.2(80.3.11*(4.82+10.58)+1649.63*4.54)
    106.81*(13.42-1.5+2.62)+245.66*(13.42-5.5+2.62)+227.17*(1.12+2.62)+501.48*1.19-803.11*(4.82+2.62)-277.63*1.24
    106.81*(13.42-1.5+2.62)+245.66*(13.42-5.5+2.62)+277.17*(1.12+2.62)+501.48*1.19-803.11*(4.82+2.62)-277.63*1.24
    2×8×√1.420
    11/16+73%-(11/16-27%)
    (11/16+73%)-(11/16-27%)
    √((16.69/1.22)^2+〖75.52〗^2 )
    (121.6×1000)/(7×230)

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