sqrt0.4|4
    sqrt9
    4^1/2
    （-√7）^2+9
    3乘以3/4
    3-3/4
    78×6×83/348
    25×〖2.5〗^2/2
    arctan 4
    arctan 4
    6×（-4）-（-4）×6
    [0.3×（20%－8.5%）²＋0.4×（10%－8.5%）²＋0.3×（－5%－8.5%）2]½
    [0.3×（20%－8.5%）²＋0.4×（10%－8.5%）²＋0.3×（－5%－8.5%）2]½
    [0.3×（20%－8.5%）²＋0.4×（10%－8.5%）²＋0.3×（－5%－8.5%）2]½
    (0.3*(0.3-0.145)*(0.3-0.145)+0.4*(0.1-0.145)*(0.1-0.145)+0.3*(0.05-0.145)*(0.05-0.145),1/2)
    4+8
    4+8
    4+8
    sinπ/2
    （1264.06+25.28+27.74)×5%

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