定义新运算提高题 (回答要写出思考过程,否则,好的50悬赏金!)1.我们规定:=1,=1×2,=1×2×3,…求(1)6?;(2)如果x?=5040,求x.2.规定a·b=(a×k+b)÷(a×b),k为常数,已知5·6=6·5,求2·4-4·2的值.3.
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