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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 C 2X
Luas = panjang
200 = (50 C 2X) (40 C 2X)
2000 C 100X C 80X + 4X2 = 200
2000 C 200 C 180X + 4X2 = 0
1800 C 180X + 4X2 = 0
4X2 C 180X + 1800 = 0
2X( 2X C 30) C 60(2X + 30) = 0
(2X C 60) (2X C 3)
4X2 C I80X + 1800 = 0
2X = 60 atau 2x = 30
x= 30
x = 15
p alas = 50 C 2x
= 50 C 2.15
= 50 C 30
= 20 cm
l alas = 40 C 2x
= 40 C 2. 15
= 40 C 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 C r
24 = 2r
=r
12 = r
4. Misl ;
Waktu printer 1 = x
Waktu printer 2 = x + 1
Maka ;

= 1,2

= 1,2
= 1,2

= 1,2

= 1,2
= 1,2
= 1,2
X + 1 = 3,6
X
= 3,6 C 1
X
= 2,6
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Tugas 1

  • 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 C 2X Luas = panjang 200 = (50 C 2X) (40 C 2X) 2000 C 100X C 80X + 4X2 = 200 2000 C 200 C 180X + 4X2 = 0 1800 C 180X + 4X2 = 0 4X2 C 180X + 1800 = 0 2X( 2X C 30) C 60(2X + 30) = 0 (2X C 60) (2X C 3) 4X2 C I80X + 1800 = 0 2X = 60 atau 2x = 30 x= 30 x = 15 p alas = 50 C 2x = 50 C 2.15 = 50 C 30 = 20 cm l alas = 40 C 2x
  • 2. = 40 C 2. 15 = 40 C 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 C 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 C 1 X = 2,6