（3.12+0.9）÷[（1﹣0.4）÷0.1] （4.7+3）÷[（4﹣3.5）×2] ×+÷1415×（+） ×38．
直接写出得数+=÷3= 20×=×25×=÷=×= 121×= 1÷×= 1.25×8=××0=×1.6=（+）×12=
直接写得数== 81×= 0÷=====
直接写出得数 21×=÷2=﹣= 12÷=÷0.8= 12÷= 4﹣2= 14×÷14×=
计算：+=﹣= 12×=÷= 0×+9=÷3=×14= 20÷= 1.25××8= 14×÷14×=
+= 6÷=×0.25=÷=×= 9﹣=÷42= 1÷=
×
+
÷14
+
） 
×38．
+
=
÷3= 20×
=
×25×
=
÷
=
×
= 121×
= 1÷
×
×
×0=
×1.6=（
+
）×12=
=
= 81×
= 0÷
=
=
=
=
=
=
÷2=
﹣
= 12÷
=
÷0.8= 12÷
= 4﹣2
÷14×
=
+
=
﹣
= 12×
=
÷
=
+9=
÷3=
×14= 20÷
=
×8= 14×
÷14×
+
= 6÷
=
×0.25=
÷
=
×
= 9﹣
=
÷42= 1÷
=
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