N*129*0.2+500000=N*129*0.8-500000
    N*129*0.2+2000=N*129*0.8-2000
    N*129*0.2+400=N*129*0.8-400
    3*N*129*0.2+400=N*129*0.8-400
    3*(N*129*0.2+400)=N*129*0.8-400
    x+2>0 2(x+1)≥3x-1
    X-3÷2<2x+5÷3
    2(x-1)≤10-4(x+7.5)
    9-3(x-2)≤0
    1-（3/4）（x-1）<0.5
    3x>12
    x-3>0
    x<5
    （1+a/4）4-1
    （1+a/4）^4-1
    （x＋5）≤7
    3（X）>12
    （x）-3>0
    3x+1≥0
    x*e^(x+1)>2

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