2+7/18-5/27 是多少啊 还有6-(7/9=2/3)
问题描述:
2+7/18-5/27 是多少啊 还有6-(7/9=2/3)
2+7/18-5/276-(7/9=2/3)
6-(7/9+2/3)
答
2+7/18-5/27
通分:108/54+21/54-10/54
=119/54
6-(7/9+2/3)
去括号:6-7/9-2/3
通分:54/9-7/9-6/9
=41/9