Contact us
Choose a category below so we can get back to you as quickly as possible.
因為6≤a≤10(1) a/2≤b≤2a 則求得 3≤b≤20(2) 又因為 C=a+b 將(1)式和(2)式相加得 6+3≤a+b≤10+20 得 9≤C≤30
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.