Question

Tolong dijawab pertanyaan ini kelas X SMA !

Answer 1

Ini soal SMP

1.
a) 3m - 2 = 4m + 6

3m - 4m = 2 + 6

-m = 8

m = -8

b) 4x - 3 = 2x + 9

4x - 2x = 3 + 9

2x = 12

x = 12/2

x = 6

c) ¼(n + 8) -2 = ½(n - 6)

¼n + 2 - 2 = ½n - 3

¼n - ½n = -3

-¼n = -3

n = -3 ( -4/1)

n = 12

2.
p = 3x - 4
l = x + 1

a) Keliling = 2(p + l)

= 2( 3x - 4 + x + 1 )

= ( 8x - 6 ) cm

b) K = 34 cm

34 = 8x - 6

8x = 34 + 6

x = 40/8

x = 5

p = 3(5)- 4

p = 15 - 4

→ p = 11 cm

l = 34/2 - 11

l = 17 - 11

→ l = 6 cm

Luas = p x l

Luas = 11 x 6

Luas = 66 cm²

3)
hafiz = h
ramzi = r

r - h = 4
r + h = 24
~~~~~~~~~ +
2r = 28

r = 28/2

r = 14

h = 24 - 14

h = 10

umur Hafiz = 10 tahun, umur Ramzi = 14 tahun

Answer 2

≡ Penyelesaian :

nomor 1.]

a.)
3m - 2 = 4m + 6
3m - 4m = 6 + 2
- m = 8
m = -8

b.)
4x - 3 = 2x + 9
4x - 2x = 9 + 3
2x = 12
x = 6

c.)
¼( n + 8 ) - 2 = ½( n - 6 )
¼n + 2 - 2 = ½n - 3
¼n = ½n - 3
——————— ( kalikan 4 )
n = 2n - 12
n - 2n = - 12
- n = - 12
n = 12

nomor 2.]

panjang = ( 3x - 4 ) cm
lebar = ( x + 1 ) cm

a.)
K = 2 ( p + l )
K = 2 ( 3x - 4 + x + 1 )
K = 2 ( 4x - 3 )
K = ( 8x - 6 ) cm

b.)
K = ( 8x - 6 ) cm
34 = 8x - 6
- 8x = - 6 - 34
- 8x = - 40
- x = - 5
x = 5

maka,
panjang = ( 3x - 4 )
= ( 3(5) - 4 )
= ( 15 - 4 )
= 11 cm

lebar = ( x + 1 )
= ( 5 + 1 )
= 6 cm

Luas = p × l
= 11 cm × 6 cm
= 66 cm

nomor 3.]
misal :
Hafiz = H
Ramzi = R

R - H = 4
R + H = 24
—————— +
2R = 28
R = 14 , Ramzi = 14 tahun

R - H = 4
14 - H = 4
H = 14 - 4
H = 10 , Hafiz = 10 tahun