画一个直径是4cm的圆．
直接写得数． 1﹣0.4= 1÷×3= 0.01÷0.1=×÷×= 0.125×0.125= 12.9985×3.0023≈﹣0.7+==
3.57+2.2= 0.9﹣0.26==﹣= 3.25×4== 14÷25=÷7=
直接写得数． 0.36÷0.3= 2.5×4= 2.9×1000= 1﹣=﹣= 1÷×= 1﹣1%= 38﹣19=
直接写得数 0.36+0.4= 0.5÷0.25= 0.23= 4×÷4×=+=（﹣）×12=÷0.18= 4.8﹣1.3﹣2.7=
直接写出得数． 1.36+0.24= 320﹣180= 10﹣2= 36÷0.4=﹣=+= 1.2×50=×5= 9×=×= 0.375×4= 9÷=
﹣0.4= 1÷
×3= 0.01÷0.1=
×
÷
﹣0.7+
=
=
=
﹣
=
= 14÷25=
÷7=
=
﹣
= 1÷
×
= 1﹣1%= 38﹣19=
÷4×
+
=（
﹣
）×12=
÷0.18= 4.8﹣1.3﹣2.7=
= 36÷0.4=
﹣
=
+
= 1.2×50=
×5=
=
×
= 0.375×4= 9÷
=
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