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1988
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Problem 2
AMC 8 1988 Problem 2
AMC8 1988 年第 2 题
表达式与运算
★☆☆☆☆
The product
8
×
0.25
×
2
×
0.125
=
8\times 0.25\times 2\times 0.125 =
8
×
0.25
×
2
×
0.125
=
乘积
8
×
0.25
×
2
×
0.125
=
8\times 0.25\times 2\times 0.125 =
8
×
0.25
×
2
×
0.125
=
A.
1
8
\frac18
8
1
B.
1
4
\frac14
4
1
C.
1
2
\frac12
2
1
D.
1
E.
2
正确答案 · Correct Answer
C
解析 · Solution
Solution 1
Converting decimals to fractions yields
8
×
.25
×
2
×
.125
=
8
1
×
1
4
×
2
1
×
1
8
=
16
32
=
1
2
\displaystyle 8 \times.25×2 \times.125 = \frac{8}{1} \times \frac{1}{4} \times \frac{2}{1} \times \frac{1}{8} = \frac{16}{32} = \frac{1}{2}
8
×
.25
×
2
×
.125
=
1
8
×
4
1
×
1
2
×
8
1
=
32
16
=
2
1
.
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