Question

Jika ,nilai ab = ...

a.2
b.1
c.-3/5
d.-1
e.-2

Answer 1

*
0 = -a + 2b
-2b = -a
a = 2b

*
1/(a-b) = a
1/(2b-b) = 2b
1/b = 2b
1 = 2b.b
1 = 2b²
b² = 1/2
b = √1/2

*
0 = -a + 2b
0 = -a + 2√1/2
-2√1/2 = -a
a = 2√1/2

*
ab
= 2√1/2 . √1/2
= 2. 1/2
= 1