2/3a-(2/3a-2/3b)-3/4b
问题描述:
2/3a-(2/3a-2/3b)-3/4b
答
=2/3a-2/3a+2/3b-3/4b
=-1/12b
2/3a-(2/3a-2/3b)-3/4b
=2/3a-2/3a+2/3b-3/4b
=-1/12b