看谁算得又对又快．﹣= += ﹣= 3÷7=+= ﹣= 0.8×1.5= +0.3=
减去所得的差与相加，和是多少？
直接写得数．﹣=+= 1+=﹣= 1﹣=+= 1﹣=++= 6﹣= 7﹣﹣= 8﹣4=+++=
直接写出得数．+= 1﹣=﹣=+=﹣=﹣0=+=+=++=++=
直接写得数.﹣=+= 3﹣=+=
请选择合适的方法计算下面各题． 1﹣﹣﹣+++﹣﹣+﹣．
﹣
= 
+
= 
﹣
= 3÷7=
+
= 
= 0.8×1.5= 
+0.3=
减去
所得的差与
相加，和是多少？
﹣
=
+
= 1+
=
﹣
=
=
+
= 1﹣
=
+
+
=
﹣
= 7﹣
﹣
= 8﹣4
=
+
+
+
=
+
= 1﹣
=
﹣
=
﹣
=
﹣0=
+
=
+
=
+
+
=
+
+
=
﹣
=
+
= 3﹣
=
+
=
﹣
﹣
+
+
+
﹣
﹣
+
﹣
．
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