若|ax+2|≥b的解為x≤-3或x≥4,求2ax-b>0的解為?
回答 (1)
若|ax+2|>=b的解為x<=-3或x>=4,求2ax-b>0的解為?
Sol
x<=-3或x>=4
x-0.5<=-3.5或x-0.5>=3.5
|x-0.5|>=3.5
|-x+0.5|>=3.5
|-4x+2|>=14
a=-4,b=14
-8x-14>0
-14>8x
-7/4>x
收錄日期: 2021-04-30 21:48:44
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