Question 364279
{{{(1/a +1/b)  /  (2/a + 2/b)=(ab(1/a +1/b))  /  (ab(2/a + 2/b))}}}
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{{{(1/a +1/b)  /  (2/a + 2/b)=(b+a)  / (2b + 2a)}}}
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{{{(1/a +1/b)  /  (2/a + 2/b)=(b+a)/(2(b+a))}}}
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{{{(1/a +1/b)  /  (2/a + 2/b)=highlight(1/2)}}}