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
    3.19×54 - 15.2×5.4 + 1.67×46
    4.6×1.2 + 18×0.12 + 0.64×0.5
    1.8×12.5 + 0.62×125

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