(5.64*6.15+35.41*2.88+145.33*0.94)-186.57*5.84
    (242.69-309.04)/309.04
    15.26*7.96+58.18*6.31+18.76*2.73+112.74-57.74*7.15-160.94*3.15
    277.49*1.25*1.1
    36.79*14.02+109.31*11.86+16.28*9.3+164.03*7.29+441.61*2.94+23.96+0.13-119.26*13.26-188.36*9.26-538.88*2.35-36.9*0.13
    (5.64*10.3+35.41*7.03+217.27*4.65+350.35*1.56)/9.99
    36.79*14.02+109.31*11.86+16.28*9.3+164.03*7.29+441.61*2.94+23.96+0.13-119.26*13.26-188.36*9.26-36.9*0.13
    36.79*14.02+109.31*11.86+16.28*9.3+164.03*7.29+441.61*2.94+23.96+0.13-119.26*13.26-188.36*9.26-791.27*2.35-36.9*0.13
    38.54*7.32+90.24*5.34+16.01*2.64+120.51*0.98-89.19*7.11-176.05*3.11
    e54.6083
    -1^6-(-11/2)*4/11+(-2)^3/[(-3)+5]
    -3^2
    (-3)^2
    -3^2-125*(-2/5)^2-18/(-3)^2
    -3^2-125*(-2/5)^2-8/(13)^2
    300*6.3-（300*3.6-45*6.3-1000）*2.5%-300*6.3*15%-300*6.3*1%-45*6.3-1000=
    （-1.5+7/3-13/14）/(-1/42)
    （-1.6+7/3-13/14）/(-1/42)
    （-17）*125%+1.25*（-10）-1.25*（-5）
    34.83*5.09+8.37*3.56+202.14*1.4-244.98*5.65

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