MATEMATIKA SMP NIH PLEASE DENGAN CARANYA nomer 4.8.9.10

4.S = 1:600
Panjang pada Gambar = 15cm
Lebar pada Gambar = 8cm
Panjang sebenarnya = 15/1/600
=15×600/1
=9000cm
=90m
Lebar sebenarnya = 8/1/600
=8×600/1
=4800cm
=48m
Luas sebenarnya = 90×48=4320m persegi (²)

8.12/(3-√5) x (3+√5)/(3+√5)
= (36+12√5)/(9-5)
= (36+12√5)/4
= 9+3√5

9.Un = a + (n - 1) b + 1/2 (n - 1) (n - 2) c
U10 = 3 + 9 x 6 + 1/2 x 9 x 8 x 3
U10 = 3 + 54 + 108
U10 = A.165 batang korek api

10.U2 = a.r = 10
U6 = a.r^5 = 160

a.r^5 = 160
a.r . r^4 = 160
10 . r^4 = 160
r^4 = 160/10
r^4 = 16
r = 2

a.r = 10
a. 2 = 10
a = 10/2
a = 5

U10 = 5.2^9
U10 = 5. 512
U10 = 2560

caranya :

4.S = 1:600
Panjang pada Gambar = 15cm
Lebar pada Gambar = 8cm
Panjang sebenarnya = 15/1/600
=15×600/1
=9000cm
=90m
Lebar sebenarnya = 8/1/600
=8×600/1
=4800cm
=48m
Luas sebenarnya = 90×48=4320m persegi (²)

8.12/(3-√5) x (3+√5)/(3+√5)
= (36+12√5)/(9-5)
= (36+12√5)/4
= 9+3√5

9.Un = a + (n - 1) b + 1/2 (n - 1) (n - 2) c
U10 = 3 + 9 x 6 + 1/2 x 9 x 8 x 3
U10 = 3 + 54 + 108
U10 = A.165 batang korek api

10.U2 = a.r = 10
U6 = a.r^5 = 160

a.r^5 = 160
a.r . r^4 = 160
10 . r^4 = 160
r^4 = 160/10
r^4 = 16
r = 2

a.r = 10
a. 2 = 10
a = 10/2
a = 5

U10 = 5.2^9
U10 = 5. 512
U10 = 2560

semoga membantu!