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n² = 2
n = + √2
b. soalnya kurang jelas
c. 9n + 6 = 27/9
9n = 27/9 - 6
9n = -27/9
n = -27/81 = -1/3
2. a. 2,35 x 10^4
b. 3,45 x 10^(-3)
3. 2(10)^0- (10)^-1 -(10)^-2 = 2(1) - 0,1 - 0,01 = 2 - 0,11 = 1,89
4. a. 27/64
b. 4/9
c. -1/27
d. (2/3)^-3 x (2/3)^2 = (2/3)^-1 = 3/2