2t^2-7t+3小于等于0解法

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2t^2-7t+3小于等于0解法2t^2-7t+3小于等于0解法2t^2-7t+3小于等于0解法2t^2-7t+3(2t-1)(t-3)所以1/22t2-7t-4=0(2t+1)(t-4)=0t=4或

2t^2-7t+3小于等于0解法
2t^2-7t+3小于等于0解法

2t^2-7t+3小于等于0解法
2t^2-7t+3<=0
(2t-1)(t-3)<=0
所以
1/2<=t<=3

2t2-7t-4=0 (2t+1)(t-4)=0 t=4或-?
很不错哦,你可以试下
h膜w铵zΗv〃ャfo瞍sΓk、w铵f85268508382011-9-14 22:58:22

(2t-1)(t-3)=0
t1=0.5 t2=3 所求范围是大于等于0.5 ,小于等于3