Դաս 18.
Առաջադրանքներ՝ 241, 242, 243
Առաջադրանքներ՝ 241, 242, 243
241
ա
(n – 2) x 180/n = 60
(n – 2) x 180 = 60n
180n – 360 = 60n
180n – 60n = 360
120n = 360
n = 360 : 120
n = 3
բ)
(n – 2) x 180/n = 90
(n – 2) x 180 = 90n
180n – 360 = 90n
180n – 90n = 360
90n = 360
n = 360 : 90
n = 4
գ) (n — 2) * 180/n = 135
(n — 2) * 180 = 135n
180n — 360 = 135n
180n — 135n = 360
45n = 360
n = 360 : 45
n = 8
դ) (n – 2) x 180/n = 150
(n – 2) x 180 = 150n
180n – 360 = 150n
180n – 150n = 360
150n = 360
n = 360 : 150
n = 2.4
242
360 : 60=6
360 : 30=12
360 : 90=4
360 : 36=10
360 : 18=20
360 : 72=5
Դաս 17.
Առաջադրանքներ դասագրքից՝ 238, 239, 241
239
ա)
(3 – 2) x180=180
180 : 3 = 60
բ) (5 – 2) x180=540
540 : 5 = 108
գ)
(6 – 2) x 180=720
720 : 6 = 120
դ)
(10 – 2) x180=1440
1440 : 10 = 144
ե)
(18 – 2) x 180=2880
2880 : 18 = 160
241
ա) (n – 2) x 180/n = 60
(n – 2) x 180 = 60n
180n – 360 = 60n
180n – 60n = 360
120n = 360
n = 360 : 120
n = 3
բ)
(n – 2) x 180/n = 90
(n – 2) x 180 = 90n
180n – 360 = 90n
180n – 90n = 360
90n = 360
n = 360 : 90
n = 4
գ)
(n – 2) x 180/n = 135
(n – 2) x180 = 135n
180n – 360 = 135n
180n – 135n = 360
45n = 360
n = 360 : 45
n = 8
դ)
(n – 2) x 180/n = 150
(n – 2) x180 = 150n
180n – 360 = 150n
180n -150n = 360
150n = 360
n = 360 : 150
n = 2 , 4
Նարե Խաչատրյանի բլոգ 