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a+b=3/5
-------------- -
-2b = -1/5
b = -1/5 per -2
b = 1/10
a + b = 3/5
a + 1/10 = 3/5
a = 3/5 - 1/10
a = 5/10 = 1/2
a × b = 1/10 × 1/2 = 1/20
a+b=3/5
______-
-2b=-1/5
2b=1/5
b=1/10
subtitusikan b=1/10 ke a-b=2/5
a-1/10=2/5
a=2/5+1/10
a=1/2
maka ab = 1/2 x 1/10 = 1/20