计算①2x/5x-3÷3/25x²-9·x/5x+3②a-1/a÷a-1/a²
1个回答
①2x/5x-3÷3/25x²-9·x/5x+3
=2x/(5x-3)÷3/(5x-3)(5x+3)*x(5x+3)
=2x²/3
②a-1/a÷a-1/a²
=(a-1)/a÷(a-1)/a²
=a
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