问题补充:
已知实数m、n、k满足m-n=8,mn+k方=-16,计算m+n+k的值
答案:
因为m-n=8 所以m=8+n 由于[email protected]=-16 即(8+n)[email protected]=-16 [email protected][email protected]=-16 [email protected][email protected] [email protected]=-([email protected]) [email protected]=-(4+n)@2 因为[email protected]>=0 -(4+n)