把他们画成同分母的分数。[3，4,7]=84
我会算．++ 1﹣﹣++﹣﹣++ 1﹣﹣．
1﹣=+=﹣=+=﹣=+=+=+=
（1）先计算下面各题，再看看有什么规律．+=﹣=+=﹣=+=﹣= （2）根据上面的规律，直接写出下面各题的得数．+=﹣=+=﹣=+=﹣=
我会算．++﹣．
计算下面各题．﹣=﹣=﹣==﹣=﹣= 1﹣= 1﹣= 1﹣=
+
+
1﹣
﹣
+
+
﹣
﹣
+
+
﹣
．
=
+
﹣
=
+
﹣
=
+
=
+
=
+
=
+
=
=
﹣
=
﹣
=
+
﹣
=
+
=
﹣
+
=
﹣
=
+
+
﹣
．
﹣
=
﹣
=
﹣
=
=
﹣
=
﹣
= 1﹣
= 1﹣
= 1﹣
=
粤公网安备 44130202000953号