877.68<877.68(1+x%)*0.8<877.68(1+10%)
    435.67<435.67(1+x%)*0.8<435.67(1+15%)
    435.67<435.67(1+x%)*0.8<288.5(1+15%)
    288.5<288.5(1+x%)*0.7<288.5(1+10%)
    288.5<288.5(1+x%)*0.7<288.5
    288.5<288.5(1+x%)0.7<288.5(1+10%)
    288.5<288.5(1+x%)<288.5(1+10%)
    -450+x-690-x*8%/4>500
    √x+√x＞3
    （3-a）/2a≤-1
    x^2-5+6＜0
    x（x-6）＜0
    （x-1）(x+2)(x-3)>0
    4x大于等于1
    2x+3/x-2小于等于0
    （x+1）≥0
    （x-4）≥0
    （x+1）（x-4）≥0
    （2x+3）/3-（1/2）x≥1
    2x＞4x-6

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