问题
填空题
已知a=
|
答案
∵a=
=
-5 3
+5 3
=4-8-2 15 2
,b=15
=4+
+5 3
-5 3
,15
∴a3+b3-367=(a+b)(a2-ab+b2)-367,
=(4-
+4+15
)[(4-15
)2-(4-15
)(4+15
)+(4+15
)2]-367,15
=8×[16+15-8
-(16-15)+16+15+815
]-367,15
=8×(62-1)-367,
=488-367,
=121,
∴
=11.a3+b3-367
故答案为:11.