用“
”定义一种新运算:对于任意有理数a和b,规定
.如:
,
.
(1)若
,
,求
的值
(2)我们知道:有理数的加法运算和乘法运算满足交换律.那么你认为这种运算:“
”是否一定满足交换律?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e16415b61722f9961e412386e6819f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b2f771e7c1c127703296c6ff3eb0657.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae9aa4301b00e788fc10c5160ecd0fea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b145c8663d380348ba9585a294f238e.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4435d10627da6b20e56728d46d7eb34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ba82739adaf71daf137b8c460006e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c9c27f8a35f0b5040769f469d2d234f.png)
(2)我们知道:有理数的加法运算和乘法运算满足交换律.那么你认为这种运算:“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e16415b61722f9961e412386e6819f.png)
更新时间:2023-11-08 21:04:25
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解答题-计算题
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适中
(0.65)
名校
【推荐2】计算:
(1)
(2)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82dd0d42662a027f03f648b615131dae.png)
(3)
(4)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c292f1d27e684cc066702dc520c9f467.png)
(5)
(6)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3370649da018d8c96ffb7bfff912b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82dd0d42662a027f03f648b615131dae.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0947da495f7889f08ba498ce62514035.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c292f1d27e684cc066702dc520c9f467.png)
(5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d3b8a4e3ca726417aecabf9332d6d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dd8f80d488bd2a0851ba29f4f895390.png)
您最近一年使用:0次
解答题-计算题
|
适中
(0.65)
名校
【推荐2】a,b为有理数,若规定一种新的运算“⊕”:定义a⊕b=a×b﹣2×(b﹣a)﹣5,
例如:2⊕3=2×3﹣2(3﹣2)﹣5=6﹣2﹣5=﹣1.
请根据“⊕”的定义计算:
(1)﹣2⊕4;
(2)(﹣1⊕1)⊕(﹣7).
例如:2⊕3=2×3﹣2(3﹣2)﹣5=6﹣2﹣5=﹣1.
请根据“⊕”的定义计算:
(1)﹣2⊕4;
(2)(﹣1⊕1)⊕(﹣7).
您最近一年使用:0次