（90+88+94+84）/4
    178/2
    86+92
    30*24-16x^2=80
    30*24-（30-2x）（24-2x）=80
    200-199+198-197+......+2-1
    arctan0.25
    1+1=2
    1+1=
    2:2
    (-21/5)^2+(18/5)^2-4×21/5-8×18/5+19
    (-21/5+3)^2+(18/5-2)^2+2×21/5-4×18/5+6
    (-21/5+3)^2+(18/5-2)^2
    (-21/5+3)^2+(18/5-22)^2
    (-21/5+3)^2+(18/5+2)^2
    (-21/5+3)^2+(18/5+2)^2+2×21/5-4×18/5+6
    (-21/5+3)^2+(18/5)^2+2×21/5-4×18/5+6
    10+2×21/5-4×18/5
    -21/5+2×18/5-5
    (18/5)^2-8×18/5+12+(21/5)^2-4×21/5+3

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