五年级数学题：用你喜欢的方法计算
问题描述：
五年级数学题：用你喜欢的方法计算
大概是脱式跟简单
19/12+7/5+5/12-2/5
5/7+（2/7-5/6）
3-5/9-3/5-4/9
18/11-（16/17-4/11）
4/5-(13/16-5/16)+3/4
1/2+2/5-3/10+0.6
格式如下：
XX/XX-XX/XX+XX/XX
=XXXXXXXXXXX
=XXXXXX
=XX
分子/分母
答
19/12+7/5+5/12-2/5
= 19/12+5/12+7/5-2/5
= 24/12 + 5/5
= 2+1
=3
5/7+（2/7-5/6）
= 5/7+ 2/7 -5/6
= 7/7 -5/6
= 1-5/6
= 1/6
3-5/9-3/5-4/9
= 3-(5/9+4/9)-3/5
= 3-1-3/5
= 2- 3/5
= 1又 2/5
18/11-（16/17-4/11）
= 18/11+4/11-16/17
= 22/11 -16/17
= 2 -16/17
= 1又1/17
4/5-(13/16-5/16)+3/4
= 4/5 - 1/2 +3/4
= 4/5 -(1/2-3/4)
= 4/5 -1/4
= 11/20
1/2+2/5-3/10+0.6
= 0.5+0.4-0.3+0.6
= 1.2