问题
填空题
已知a=3,b=1,那么2a-5b=______,a2-b3=______,a3-
|
答案
(1)2a-5b,
=2×3-5×1,
=6-5,
=1,
(2)a2-b3,
=32-13,
=9-1,
=8,
(3)a3-
,8 b
=3×3×3-
,8 1
=27-8,
=19,
故答案为:1;8;19.
已知a=3,b=1,那么2a-5b=______,a2-b3=______,a3-
|
(1)2a-5b,
=2×3-5×1,
=6-5,
=1,
(2)a2-b3,
=32-13,
=9-1,
=8,
(3)a3-
,8 b
=3×3×3-
,8 1
=27-8,
=19,
故答案为:1;8;19.