>
数学
>
如果定义一种新运算为
a*b=
a+b
1−ab
,请计算
(
1
2
*
1
5
)
*
1
8
.
人气:435 ℃ 时间:2019-08-16 21:38:02
解答
由新定义运算法则
a*b=
a+b
1−ab
可知:
(
1
2
*
1
5
)
*
1
8
,
=
1
2
+
1
5
1−
1
2
×
1
5
*
1
8
,
=
7
9
*
1
8
,
=
7
9
+
1
8
1−
7
9
×
1
8
,
=1.
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