直接写出得数．×4= ×= ÷= ××=1÷= 1÷= ×0.75= ×14+=1﹣= += ÷5= ÷×÷=
口算+=﹣=+ =﹣= 1﹣= ﹣=．
+=+=﹣=﹣=﹣= 1﹣= 1﹣=+=﹣=
用你喜欢的方法计算下面各题．+﹣﹣+﹣﹣﹣（﹣）+﹣++++（﹣）﹣+﹣．
直接写得数． 1﹣=+=+= 1﹣﹣=+3=+=+=++=
计算下面各题．=========
×4= 
×
= 
÷
= 
×
=
= 1
÷
= 
×0.75= 
×14+
﹣
= 
+
= 
÷
×
+
=
﹣
=
+ =
﹣
=
= ﹣
=
．
+
=
+
=
﹣
=
﹣
=
﹣
=
= 1﹣
=
﹣
+
﹣
﹣
+
﹣
﹣
﹣
）
+
﹣
+
+
+（
﹣
）
﹣
+
﹣
．
=
+
=
+
= 1﹣
﹣
=
+3=
+
=
+
=
+
+
=
=
=
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=
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