0.8^(3)-ln0.8-0.75*0.8
    x>1<2
    2*sqrt(x-3)=x-6
    1>x<2
    20*0.15X+44*0.85X=18589*0.53
    20*0.15X+44*0.85X=14589*0.53
    2x>-1 -3x+9≥0
    2x-7<5-2x
    -2≤x+1<1
    -2
    2x+2>0 -x>-1
    0.8÷0.2
    42.3×1.8 - 2.3×1.8
    12×1.3 + 0.12×420 + 5.5×0.88
    0.68×89 - 7.9×6.8
    89.8×12.5 - 980×0.125
    2.34×12.5 - 22.6×1.25
    3.21×45.6 + 0.321×544
    0.3×1.25 + 5×0.125
    100.8×2.5 - 1004×0.25

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