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10¹/7 = sisa 3
10²/7 = sisa 2
10³/7 = sisa 6
10⁴/7 = sisa 4
10⁵/7 = sisa 5
10⁶/7 = sisa 1
10⁷/7 = sisa 3 ← pola ke-7
10⁹⁹⁹⁹⁹⁹⁹⁹⁹/7 = 10⁶⁽¹⁶⁶⁶⁶⁶⁶⁶⁶⁾⁺¹
= sisa 3
9. L = 5
sisi miring = 5
anggap sisi a,b,c dan c adalah sisi miring
5² = a²+b²
L = (a.b)/2 → 10 = a.b
25 = a²+b²
25 = (a+b)² - 2ab
25 = (a+b)² - 20
45 = (a+b)²
√45 = a+b
3√5 = a+b
keliling = a+b+c
= 3√5 + 5
= 5+3√5
10. ⁴log(²log x) + ²log(⁴log x) = 2
⁴log(²log x) + ⁴log(⁴log x)² = ⁴log 4²
²log x + (⁴log x)² = 16
2.⁴log x + (⁴log x)² = 16 ; misal y = ⁴log x
2y + y² = 16
y² + 2y - 16 = 0 ← susah nih (akar2an)
y1 = -1-√17
x = 4^(-1-√17)
y2 = -1+√17
x = 4^(-1+√17)