1. TUGAS 1
1. Dik ;
Luas tanah = 60m × 30m
Luas lapangan =1000m L lap =(30-X)
Luas lapangan = P lap × L lap
=(60-X)×(30-X) = 1000
= 1800-60X-30X X2 = 1000
= 1800-90X X2 = 1000
= X2-90X 1800-1000 = 0
= X2-90X+800=0
= (X - 10)(X - 80)
X= 10 atau X=80
2. Dik ;
Luas alas = 200
Panjang alas = 50 - 2X
Lebar alas = 40 – 2X
Luas = panjang
200 = (50 – 2X) (40 – 2X)
2000 – 100X – 80X + 4X2 = 200
2000 – 200 – 180X + 4X2 = 0
1800 – 180X + 4X2 = 0
4X2 – 180X + 1800 = 0
2X( 2X – 30) – 60(2X + 30) = 0
(2X – 60) (2X – 3)
4X2 – I80X + 1800 = 0
2X = 60 atau 2x = 30
x= 30
x = 15
p alas = 50 – 2x
= 50 – 2.15
= 50 – 30
= 20 cm
l alas = 40 – 2x

2. = 40 – 2. 15
= 40 – 30
= 10 cm
V=p
= 20. 10. 30
= 6000 cm2
3. Dik ;
V = 1/3. r2.t
= 1/3. . r2.3
Volume akibat penambahan jari
V1 = 1/3. . (r + 24)2 3
V2 = 1/3. . r2( 3 + 24)
= 1/3. . r2.27
V1 = V2
1/3. (r + 24)2 3 = 1/3. .
r2.27
1/3. (r + 24)2 3 =
r2 . 9
(r + 24)2 = r2 . 9
(r + 24)2 = r2 . 9
r + 24 =
r + 24 = 3r
24 = 3r – r
24 = 2r
=r
12 = r
4. Misl ;
Waktu printer 1 = x
Waktu printer 2 = x + 1
Maka ;
= 1,2
= 1,2

3. = 1,2
= 1,2
= 1,2
= 1,2
= 1,2
X + 1 = 3,6
X
= 3,6 – 1
X
= 2,6