Question

單項(xiàng)式-

3

5

πxy的系數(shù)是（　�。�

• A．-

  3

  5

• B．

  3

  5

• C．-

  3

  5

  π
• D．

  3

  5

  π

Answer 1

分析：根據(jù)單項(xiàng)式系數(shù)的定義來選擇，單項(xiàng)式中數(shù)字因數(shù)叫做單項(xiàng)式的系數(shù)．

解答：解：∵-

3

5

πxy=-

3

5

π•xy，
∴單項(xiàng)式-

3

5

πxy的系數(shù)是=-

3

5

π．
故選C．

點(diǎn)評：本題考查了單項(xiàng)式．把一個單項(xiàng)式分解成數(shù)字因數(shù)和字母因式的積的形式后再來確定單項(xiàng)式的系數(shù)．