Mathematics
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    -7^2+2*(-3)^2-(-6):(-1/3)^2
    log0.5乘-5
    2乘1/2
    (-1)^2+(-6)*(-1/2)-8:(-2)^3=
    (4-1.6)*600+(6-3.5)*1000+(2-1.2)*1300-600-1000-200
    (4-1.6)*600+(6-3.5)*1000+(2-1.2)*400-600-1000
    500*22000+40*120*500+60000+5000*500+1000
    1000*15000+20*120*1000+60000+5000*1000+1000
    60000+1000+22000*500+40*120*500+4000*500
    60000+1000+15000*1000+20*120*1000+4000*1000
    0.01/0.1
    3.2-1.2*(0.01/(1-0.9))
    1.25*(8+0.8)*2.5
    1.25*8
    2.5*0.8
    1.25*(8+0.8)*2.5
    1.25*1.8*2.5*16
    1.2*(2+28.16/32)
    2.58-2.58*0.55-2.58*0.35
    6-1/2

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