数学题 急！

Question

Dalam rajah di sebelah, PQ dan RS ialah garis lurus. Cari nilai x.

In the diagram, PQ and RS are straight lines. Find the value of x.

Answer 1

3x° = 25° + x°

= 2x° + x°

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2x° = 25°

x° = 25°/2

= 12.5°

Answer 2

3x会等于x+25°因为他们是vertical opposite angles (vert.opp.angles./对顶角)

所以解法如下

3x=x+25°

2x=25°

x=12.5°

Answer 3

3x = x + 25°

3x - x = 25°

2x = 25°

x = 25° / 2

x = 12.5°

Answer 4

3x°=25°+x°

3x°-x°=25°

      2x°=25°

       x=12.5°

Answer 5

x+25=3x

3x-25=x

3x-x=25

2x=25

x=12.5

Answer 6

3x=25+x

3x-x=25

2x=25

x=12.5

Answer 7

3x=25º+x

3x-x=25º

所以25=2x

x=25÷2

=12.5