-2+1
    -2--1
    -2-(-1)
    -1+2
    -1-2
    -6/10-7/10
    (4414×21.7)/(5636×19.52+187.51×6.83+25.13×4.33)
    (4414×21.7)/(5636×1952.19+187.51×6.83+25.13×4.33)
    340.519×1.15+2×10.5×√1.15
    10×1.15+2×10.5×√1.15
    10+6.27×19.7+10×20.7
    10+6.27×7.7+10×8.7
    433.22×0.87-2×10.5×√0.87
    96.43+6.27×20.7+10×20.7
    (3980.19×21.7)/(4516×20.37+187.51×6.83+25.13×4.33)
    25*3.14*2+37.68
    31.4*1.3
    3.14*1.3
    3.14*12
    0.6*3.14*40+0.3*0.3*3.14

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