7/15+(9/16-7/15)
=7/15+9/16-7/15..........去括号
=7/15-7/15+9/16.............交换律
=9/16
解:原式=7/15+9/16-7/15(去括号法则) =7/15-7/15+9/16(加法交换律) =9/16收到请采纳,收到请采纳!!!
=7/15-7/15+9/16
=0+9/16
=9/16
计算过程如上