4-2/3+8/3
    lnC(5,9)
    lgA(5,7)
    √2(√2+2）/2
    2+2√2/2
    0.1103*6.891^2 - 1.9454*6.891 + 17.504
     -0.000053333*68.872^3 + 0.011000000*68.872^2 - 0.757666667*68.872 + 18.070000000
    0.00003867*68.872^3 - 0.007740007*68.872^2 + 0.519133337*68.872-11.17600000
    4*10^(-5)*68.872^3 - 0.0077*68.872^2 + 0.5191*68.872- 11.176
    2*（-3）+1/4∧-1-（-2）∧2
    -5/36+5/6
    95.3÷133
    234+567
    12+67/34
    12+67
    123/3 156/3 189/3
    123/3 156/3
    12+34+56 12+34*56 12-34+56 12-34-56
    12+34+56 12+34*56 12-34+56
    12+34+56 12+34*56 12+34/56

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