Tugas Matematika menyenangkan

1. NO.1
Rata-rata =
∑𝐹𝑖𝑋𝑖
∑𝐹𝑖
=
1112,8
32
= 34,775
Data Fi Xi FiXi
10-19 2 14,5 29
20-29 8 24,5 196
30-39 12 34,5 412,8
40-49 7 44,5 311,5
50-59 3 54,5 163,5
32 1112,8

2. No.10
(n+1)! = 9n!
n+1 . n! = 9n!
n+1 =
9𝑛!
𝑛!
n+1 = 9
n = 9-1
n = 8

3. No.12
10P4 =
10!
6!
=
10𝑥9𝑥8𝑥7𝑥6!
6!
= 90 x 56
= 5040

4. No.15
2! X 5Psiklis
= 2 x (5-1)!
= 2 x 4!
= 2 x (4x3x2)
= 2 x 24
= 48
𝑛(𝑎)
𝑛(𝑠)
=
2
24
=
1
12

5. No.18
X=2
P (7,8) = 2𝑎−𝑥
𝑦
= 2.2−7
8
= 4−7
8
= −3
8

6. No.27
lim
𝑥→∞
𝑥3
− 2𝑥2
− 5
2𝑥3 − 𝑥
lim
𝑥→∞
𝑥3 − 2𝑥2 − 5
𝑥3
2𝑥3 − 𝑥
𝑥3
lim
𝑥→∞
1 − 0 − 0
2 − 0
lim
𝑥→∞
1
2

7. No.28
lim
𝑥→∞
(2𝑥 − 2)3
(3𝑥 + 3)3
lim
𝑥→∞
2𝑥 − 2
𝑥
3
3𝑥 + 3
𝑥
3
lim
𝑥→∞
2 3
3 3
lim
𝑥→∞
8
27

8. Nama Kelompok
Ronaldo lubis
Tengku Fardhon A
Nomor yang dikerjakan
1,10,12,15,18,27, dan 28