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Problem 6
AMC 8 1986 Problem 6
AMC8 1986 年第 6 题
表达式与运算
★★☆☆☆
题干整理中
A.
-3
B.
−
4
3
\displaystyle -\frac{4}{3}
−
3
4
C.
2
3
\displaystyle \frac{2}{3}
3
2
D.
2
E.
6
正确答案 · Correct Answer
E
解析 · Solution
Solution 1
2
1
−
2
3
=
2
÷
(
1
−
2
3
)
=
2
÷
1
3
=
2
⋅
3
=
6
\displaystyle \frac{2}{1-\frac{2}{3}} = 2 \div \left(1 - \frac{2}{3}\right) = 2 \div \frac{1}{3} = 2 \cdot 3 = 6
1
−
3
2
2
=
2
÷
(
1
−
3
2
)
=
2
÷
3
1
=
2
⋅
3
=
6
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