221/1+8.7%*8.7%
    12*15
    0.032/12
    3.14*7*85*0.000001*5.67*0.9((2.73+89*0.01)^4-3.01^4)
    0.16*40.76*0.9
    10*3.14*0.4*0.001*85*0.001*(89-28)
    0.075/12
    1.038500000000000/1.0385^0.5
    3.14*0.4*75*0.000001*5.67*((2.73+78*0.01)^4-3.01^4)
    3.14*0.4*75*0.000001*5.67*((2.73+53*0.01)^4-3.01^4)
    0.476158/12
    (1+0.12/4)^4-1
    eC(2,5)
    0.06/12
    8*((1-1.12682503^(-12*4))/0.12682503)/(1.12682503)^2
    1000*((1-1.08^(-20))/0.08)
    850×(850×5)
    cos(0.0001)
    tan(232.219737)
    =arctan(450-150-200）/(4200-1500-350-400）

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