Mathematics
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    20.58+23.78*2.8-5.71*2.8^2
    20.58+23.78*4.165-5.71*4.165^2
    2/(-(8/7)^0.5+1)
    2/((8/7)^0.5+1)
    2/((8/7)^0.5-1)
    2/((8/7)^0.5)
    1+0.1037(6+3)+18/((6+3)^2 )[0.1037(6+3) ]^2=
    199*11-2*93
    0.764*2566.48+(1-0.764)*151.47
    8÷2(2+2)
    56+87
    -1*2
    1/4+1/30+1/42+1/20
    1/4+1/30+1/42+0.05
    789+321
    3X-4≥1
    √(12^2+24^2)
    0.15×a+a=270000
    182.5+0.2(x-350)=166
    182.5=0.2(x-350)

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