-1≤(2m-1)/(3m+2)≤1
不等式同乘以(3m+2)²得-(3m+2)²≤(2m-1)(3m+2)≤(3m+2)²,因?yàn)?3m+2)²是正的,不變號(hào).
可拆成兩個(gè)不等式來解,
15m²+13m+2≥0,分解因式得(3m+2)(5m+1)≥0,所以m≥-1/5或m≤-2/3.
3m²+11m+6≥0,分解因式得(3m+2)(m+3)≥0,所以m≤-3或m≥-2/3.
然后你畫個(gè)數(shù)軸,綜上有m≤-3或m≥-1/5.
-1
-1<=(3m+2)分之(2m-1)<=1 這種式子怎么算 結(jié)果是m<= -3或m>=-5分之1
數(shù)學(xué)人氣:840 ℃時(shí)間:2020-02-02 19:43:26
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