直接写得数．﹣=×6=÷=+= 0.22= 2﹣1÷= 0.66+0.4= 0.625++= 1﹣﹣= 2.08÷0.25÷4=
口算== 18×=÷3= 9.9+0.1×=×= 1÷10%=÷1.25=×13=（21+）÷7=
口算： 2﹣1= 1.4﹣= 1÷=÷1=+= 2+0.25= 9.2×0.25×4= 7×1.3+7×6.7= 4﹣（+）=﹣=
直接写得数． 1.5×0.8= 5.6+2.8=×=﹣=÷=÷=+= 12﹣=÷= 2.5÷0.5=
0.46+1.54= ；+= ；÷80%= ； 25×0.16×8= ； 44÷= ；×= ； 1÷0.5×2= ；（﹣）+= ．
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﹣
=
×6=
÷
=
+
= 0.66+0.4= 0.625+
+
= 1
﹣
﹣
= 2.08÷0.25÷4=
=
= 18×
=
÷3=
=
×
= 1÷10%=
÷1.25=
×13=（21+
）÷7=
= 1.4﹣
=
+
=
+0.25= 9.2×0.25×4= 7×1.3+7×6.7= 4
﹣（
+
）=
=
×
=
﹣
=
÷
=
÷
=
+
= 12﹣
=
÷
= 2.5÷0.5=
+
= ；
÷80%= ； 25×0.16×8= ；
= ；
×
= ； 1÷0.5×2= ；（
﹣
）+
= ．