（1）8.65×99+8.65
=8.65×100
=865
（2）12.83×101-12.83
=12.83×100
=1283
（3）5/12×8/9+5/12×1/9
=5/12×（8/9+1/9）
=5/12×1
=5/12
下面的计算题怎么写?求过程 有悬赏!
（1）8.65×99+8.65
=8.65×100
=865
（2）12.83×101-12.83
=12.83×100
=1283
（3）5/12×8/9+5/12×1/9
=5/12×（8/9+1/9）
=5/12×1
=5/12