0.54*1.8-(0*(1-0.54)
    0.54*8-(5*(1-0.54)
    0.54*80-(50*(1-0.54)
    0.54*1.8-(1*(1-0.54)
    0.54*2-(1*(1-0.54)
    2∧10+5
    5/3*300
    5/2*300
    5*6000000
    1800-540
    0.6391*0.137+0.3609*0.052
    0.6459*0.137+0.3541*0.052
    1000*[1-1/(1.04^40)]+1000/(1.04^40)
    209080.756*5000
    40/0.04*[1-(1/1.04^40)+1000/(1.04)^40
    15÷5/3
    15÷3/5
    cos7.7
    134.377896*cos23.4*cos6/sin6
    134.377896*sin23.4+1120=

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