(a+b)方=6,(a-b)=8,求a方+b方和ab的值

问题描述:

(a+b)方=6,(a-b)=8,求a方+b方和ab的值

(a-b)方=64=a方+b方-2ab 所以 (a-b)方-(a+b)方=-2ab-2ab=-4ab =64-6=58 ab=58除以-4=-14.5 a方+b方=(a+b)方-2ab=6-2乘-14.5 =35