Zadanie zamieszczam w załaczniku Zadanie 7 i 8 ze str.125 Klasa 3 gimnazjum matematyka z plusem podrecznik plisss prosze o jak najszybsze rozwiazanie daje naj:)
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zad. 7
|AB| = 6cm
|AP| + |PB| = |AB|
|AM| + |MC| = |AC|
|AM| = 3|MC|
3|MC| + |MC| |AC|
4|MC| = |AC|
|MC| = 1/4 |AC|
|MC| / |AC| = |PB| / |AB|
1/4 |AC| / |AC| = |PB| / |AB|
|PB| / |AB| = 1/4
|PB| / 6cm = 1/4
|PB| = 1,5cm
|AP| = 6cm - 1,5cm
|AP| = 4,5cm
zad. 8
a)
(2 + 3 + 2) / 6 = (2 + 3) / y
7/6 = 5/y
7y = 30
y = 30/7
(2 + 3 + 2) / 6 = 2 / x
7/6 = 2/x
7x = 12
x = 12/7
P = (x + y)*3/2
P = (12/7 + 30/7)*3/2
P = 6*3/2
P = 18/2
P = 9
b)
(3,6 + h) / 2,5 = 3,6 / 1,5
(3,6 + h)*1,5 = 2,5 * 3,6
5,4 + 1,5h = 9
1,5h = 3,6 ||:1,5
h = 2,4
c / 5,5 = 3,6 / (3,6 + 2,4)
c / 5,5 = 3,6 / 6
6c = 19,8 ||:6
c = 3,3
P = ((c+1,5) + (5,5+2,5))*h/2
P = (3,3 + 1,5 + 5,5 + 2,5)*2,4/2
P = 12,8*1,2
P = 15,36
c)
(3 + 7) / 6 = 7 / a
10a = 42
a = 4,2
H - wys całego trójkąta = 8, bo (3+7), 6 i 8 tworzą trójkę pitagorejską :)
h - wys trapezu
3 / (3+7) = h / 8
24 = 10h
h = 2,4
P = (a + 6)*h/2
P = (4,2 + 6)*2,4/2
P = 10,2*1,2
P = 12,24