Mam kłopoty z twierdzeniem Talesa
interesują mnie podpunkty d, e i f
w d na przykład nie wiem wgl co z tym robić.
d) np. x 12
----- = --------
6 10 + 6
x 12
----- = -------
6 16
16x = 6 · 12
16x = 72 /:16
72 9
x = ------ = ------ = 4½
16 2
e) 8 + x x
-------- = ------
20 12
12(8 + x) = 20x
96 + 12x = 20x
-8x = -96 /: (-8)
x = 12
f) 7,5 7,5 + 3
-------- = -------------
x 15
10,5x = 7,5 · 15 /:10,5
7,5 · 15 75 · 15 75
x = ----------- = ---------- = -------- = 10 ⁵/₇
10,5 105 7
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d) np. x 12
----- = --------
6 10 + 6
x 12
----- = -------
6 16
16x = 6 · 12
16x = 72 /:16
72 9
x = ------ = ------ = 4½
16 2
e) 8 + x x
-------- = ------
20 12
12(8 + x) = 20x
96 + 12x = 20x
-8x = -96 /: (-8)
x = 12
f) 7,5 7,5 + 3
-------- = -------------
x 15
10,5x = 7,5 · 15 /:10,5
7,5 · 15 75 · 15 75
x = ----------- = ---------- = -------- = 10 ⁵/₇
10,5 105 7