1÷a+3 +1÷a-3 +6÷9-a²=
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1 ÷ a + 3 + 1 ÷ a - 3 + 6 ÷ 9 - a²
= 1 ÷ a + 1 ÷ a + 6 ÷ 9 - a² ( +3 + -3 = 0 )
= 2.( 1 ÷ a ) 6 ÷ 9 - a²
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