学帮网2÷（2又2/9*4/5+2又2/9-1/5*2又2/9）*9/20简算
来源：学生作业学帮网 编辑：学帮网 时间：2024/05/28 16:21:39
2÷（2又2/9*4/5+2又2/9-1/5*2又2/9）*9/20简算
2÷（2又2/9*4/5+2又2/9-1/5*2又2/9）*9/20
=2÷【20/9*（4/5+1-1/5）】*9/20
=2÷【20/9*8/5】*9/20
=2÷32/9*9/20
=2×9/32×9/20
=81/320
2÷（2又2/9*4/5+2又2/9-1/5*2又2/9）*9/20
=2÷【20/9*（4/5+1-1/5）】*9/20
=2÷【20/9*8/5】*9/20
=2÷32/9*9/20
=2×9/32×9/20
=81/320