jika a=1/6 b. 2/3. c=-1/2 tentukan nilai dari operasi berikut. a. (b+c) b. ab-bc. c. 2a+b-c^2

a) b + c
= 2/3 - ½
= 4/6 - 3/6
= 1/6

b) ab - bc
= b ( a - c )
= 2/3 ( 1/6 - ½ )
= ⅔ ( 1/6 - 3/6)
= ⅔ ( - 2/6)
= - 2/9

c) 2a + b - c²
= 2(1/6) + 2/3 - (½)²
= ⅓ + ⅔ - ¼
= 3/3 - ¼
= 1 - ¼
= ¾