(18 -1)*8/20
    -ln(1/4)-2
    (18-19.03)^2+(18.2-19.03)^2+(18.4-19.03)^2+(18.6-19.03)^2+(19-19.03)^2 +(19.2-19.03)^2+(19.4-19.03)^2+(19.6-19.03)^2+(19.9-19.03)^2+(20.2-19.03)^2
    （18-19.3）^2
    1-2ln2
    ln2
    (45.5-5)/2.153103
    (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)

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