4w+5>9
4w>9-5 (移项)
4w>4 (计算)
w>1 (系数化为1)
5-4s>1
答案s<1
(χ-2)(χ-3)-(χ-1)(χ+6)
=χ²-3χ-2χ+6-(χ²+6χ-χ-6)
=χ²-3χ-2χ+6-χ²-6χ+χ+6
=-10χ+12
χ²-1≥0.
=χ²≥1
=χ≥√1
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