lg√y＝3
    281.6÷2523.597
    105.9×23.83
    2×140.8
    284.6÷2683.506
    105.9×25.34
    142.3×2
    281.8÷2700.45
    105.9×25.5
    140.9×2
    415.9÷4308.62
    204.2×21.10
    546.8÷6350.62
    204.2×31.10
    0.5852÷6207.68×1000
    0.5852÷6207.68
    25t^2+15t-4=0
    7.8÷0.3
    0.3X+5x0 .6=9
    （32-2x)(20-x) =540

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