(18.3+18.7*3.5+18.9*7.1+19.5*7.7+20.2*6.7)/26
    (18.3+18.7*3.5+18.9*7.1+19.5*7.7+20.2*6.7)26
    1719.83*9.44+3611.29*3.03+122.15*24+373.47*19.5-1.25(1656.36*14.11+1144.37*3.15)
    cos48
    1.12➗1.6=
     914.43*8.57+468.56*2.32-122.15*15.09-373.47*10.59-931.15*1.97
    914.43*8.57+468.56*2.32-177.67*15.09-274.35*10.59-931.15*1.97
    68.54*4.99+23.66*4.99^2
    73.84*4.99+4.02*4.99^2
    111÷3
    arctan(4.93/17.36)
    （5-1）∧2*4
    (8.9*11.49+20.49*8.33+849.12*3.52+35.92*0.25)/914.43
    (8.9*11.49+20.49*8.3+849.12*3.52+35.92*0.25)/914.43
    arcsin-2.401583710407239819004524886877828054298
    11/15×4/7+4/15×4/7
    arcsin1.731900452488687
    arcsin（-0.691369）
    sin49×37÷51.042
    48×48+37×37-2×37×48×cos49

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