Mathematical Problem
回答 (2)
2007-07-10 3:44 am
✔ 最佳答案
2b<=2.5<a</a>
2007-07-09 19:46:15 補充：
唔知點解出唔到ｄ字2b<=2.5< a2b<=2.52(2x-7 over 4)<=2.52x-7 over 2<=2.52x-7<=52x<=5+72x<=12x<=62.5< a2.5< x+4 over 37.5< x+43.5< xrange of x is 3.5< x<=6自己再check check，如果仲係唔明，就問同學or老師=]
2007-07-10 5:45 am
2b <= 2.5 and a > 2.5
(2x - 7)/2 <= 2.5 and (x+4)/3 > 2.5
2x - 7 <= 5 and 2(x+4) > 15
2x <= 12 and 2x > 7
x <= 6 and x > 3.5
so, 3.5 < x <= 6
(2x - 7)/2 <= 2.5 and (x+4)/3 > 2.5
2x - 7 <= 5 and 2(x+4) > 15
2x <= 12 and 2x > 7
x <= 6 and x > 3.5
so, 3.5 < x <= 6
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