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[Problem Solving]

试题详情

题目:

A rectangular bar of length 20 feet and width 6 inches. A vertical divides the rectangle into 2 parts. This line meets the base of the rectangle at point B. The left section of the rectangle has a right inclined line from a point A on the base. It forms an angle x degrees above the base of the rectangle at point A. The right section of the rectangle has a right inclined line from a point C on the base. It forms an angle x degrees above the base of the rectangle at point C.

The figure above shows the dimensions of a rectangular board that is to be cut into four identical pieces by making cuts at points A, B, and C, as indicated. If x = 45, what is the length AB ?

(1 foot = 12 inches)

选项:

A、5 ft 6 in
B、5 ft in
C、5 ft 3 in
D、5 ft
E、4 ft 9 in

答案:

C

提问:

为什么这道题不可以设bc=x,ab=x+6 然后x+x+x+6+x+6=20,得到x=2,ab就等于8ft呢?

解答:

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阅读1483
解答: 徐小梅

提问:

为什么这道题不可以设bc=x,ab=x+6 然后x+x+x+6+x+6=20,得到x=2,ab就等于8ft呢?

解答:

点赞0
阅读1484
解答: 徐小梅老师

提问:

老师你好我不太能理解怎么求的c

解答:

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阅读2408
解答: 徐小梅老师

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