口算。2+2= 4-3=2+3= 4-1=
直接写得数： 1÷=+0.5=÷8=（+）×36=×= 5﹣=÷80%= 4﹣1﹣0.4=
直接写出得数．=== 5.6÷4= 3.4﹣8====
直接写出得数=== 3×===== 8×==
直接写出得数．=====×+=﹣=+=
直接写数对又快： 1÷=+=÷=（﹣）×18=÷3=×=﹣=×÷×=
=
+0.5=
÷8=（
+
）×36=
×
= 5
﹣
=
÷80%= 4﹣1
﹣0.4=
=
=
= 5.6÷4=
=
=
=
=
=
= 3×
=
=
=
=
=
=
=
=
=
=
=
=
×
+
=
﹣
=
+
=
=
+
=
÷
=（
﹣
）×18=
÷3=
×
﹣
=
×
÷
=
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