Soal Math Kelas 8....Tolong di bantu Kaka
4. -110
5 a. Un = 5n + 2
b. 177
c. 1090
Penjelasan dengan langkah-langkah:
4. U1 = a = 8
b = -6
Un = a + (n - 1)b
U34 = 8 + (34 - 1)(-6)
= 8 + 33 x (-6)
= 88 + (-198)
= -110
5. 7, 12, 17, 22, 27
+5 +5 +5 +5
a = U1 = 7
b = 5
a. Un = a + (n - 1)b
= 7 + (n - 1)5
= 7 + 5n - 5
= 5n + 2
b. U35 = 5 x 35 + 2
= 175 + 2
= 177
c. Sn = n/2 (2a+ (n - 1)b)
S20 = 20/2 (2 x 7 + (20 - 1)5)
= 10 x (14 + 19 x 5)
= 10 x (14 + 95)
= 10 x 109
= 1.090
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