急急急！！！！快
4/5×7/9×5/8
=4/乱派5×5/塌陪冲8×7/团歼9
=1/2×7/9
=18 分之7
4/虚改正5×7/9×5/8
4/5×5/8×7/9
4/差悔歼启8×7/9
1/2×7/9
7/18
3/8×5/7 5/8×4/7 =3/8×5/7 4/8×5/7 =(3/8 4/8)×5/7 =7/伍指8×5/7 =5/8 不会吧，这么简单的问题也来发铅胡？腔激配
等于七分之十八
或者0.38888888888888888……
4/5×7/9×5/8
==4/5×5/团歼乱派8×7/塌陪冲9
=1/2×7/9
=18 分之7