9/17×1/7+5/17÷7= 2/5÷(3/4＋2/5 )= 简便计算_数学解答

9/17×1/7+5/17÷7= 2/5÷(3/4＋2/5 )= 简便计算

人气：347 ℃　时间：2020-06-13 02:56:20

解答

9/17×1/7+5/17÷7
=9/17×1/7+5/17×1/7
=（9/17+5/17）×1/7
=14/17×1/7
=2/17
2/5÷(3/4＋2/5 )
=2/5÷23/20
=2/5×20/23
=8/23