3*1.5-(-7/6)
    3*1.5-(-7/3)
    1.5-3*(-7/6)
    ππππππππππ
    πππ
    106/11*(1+15/106+1+46/33)
    106/11*(1+15/106+1+46/33)
    38.8×0.8×0.6=
    1/2+1/3+1/24
    （30/2+20/5）/(1/2+1/5+1/4)
    55.6-55.6*2.8%
    5168-53
    3*32/3+16/9
    8.46*0.857
    1-14.3%
    (122.8/247.2)^2+ (230/560)^2
    （1600-128）/4+128
    （1600-128）/4+128
    26÷14×6+26÷14
    687×687-686×688

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