已知a=3,b=1,那么2a-5b=______,a2-b3=______,a3-8b=______.
试题难度:难度:中档 试题类型:填空题 试题内容:已知a=3,b=1,那么2a-5b=______,a2-b3=______,a3-8b=______.
试题答案:(1)2a-5b,
=2×3-5×1,
=6-5,
=1,
(2)a2-b3,
=32-13,
=9-1,
=8,
(3)a3-8b,
=3×3×3-81,
=27-8,
=19,
故答案为:1;8;19.
答:试题答案:18×9 3=162 5,165,答:A=165.故答案为:165.详情>>
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