2.39*8+5
    2.39*5+5
    2.39*4+5
    2×1.2×4000
    （((0.07-0.01)^2+(-0.02-0.01)^2+(-0.10-0.01)^2+(0.15-0.01)^2+(-0.06-0.01)^2)÷6）^0.5
    (0.07+（-0.02）+(-0.10)+0.15+(-0.06)+0.02)÷6
    (-0.04+0.06+(-0.07)+0.12+(-0.02)+0.05)÷6
    1+√0/(1+0)
    1+√3/(1+3)
    1+√2/(1+2)
    1+√1/(1+1)
    1+√1/1+1
    arccos0.93
    arccos3469/3700
    A(1,2,3) C(2,4,6)
    9.8*1.02+0.102+10.2*0.01
    sin1/2
    sin2/1
    arctan(1.53)
    （9.3*3.4+3.4*10.7）/0.17

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