（-16.2）*（-7.6）
    7.29/5.24/0.493/0.493
    33+6
    (2*0.725*9.8*(sin(45)-0.12*cos(45)))^(1/2)
    37.2^2*sin(2*14.1)/9.8
    ((149)^(-2)-(298)^(-2))^(-1/2)
    ((149*10^9)^(-2)-(298*10^9)^(-2))^(-1/2)
    ((149*10^9)^(-2)-(298*10^(-2)))^(-1/2)
    (-3.7-13.9)/(21.4-7.2)
    1.5*10^11/(3*10^8)
    1500*24+2500*16+500*18
    tan(8)
    7088+43058+53174+32035
    (43058+53174+32035)/86584
    (430858+53174+32035)/86584
    (43085+53174+32035)/86584
    (37.2×29.54-3.14×〖1.47〗^2×24)×10×9.25
    2×29.54×22.67×10
    37.2×23.64×10
    2×(37.2+29.54)×2×120

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