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
    240a+200(20-a)>4500 12a+10(20-a)=230
    240a+200(20-a)>4500 12a+10(20-a)<230
    (x+1)/2>(2x+2)/3-1
    3(x-1)<5-x
    8:88:888:8
    8:88:888:8888
    8:88:888:88888
    2x-1>5 8-4x<0
    2x^3-x^2+x-11/x+1
    2.009×43 + 20.09×2.9 + 200.9×0.28
    200.8×20.08 - 200.8×20.07

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